Cube Volume Research Articles

Fooling the size\u2013weight illusion\u2014Using augmented reality to eliminate the effect of size on perceptions of heaviness and sensorimotor prediction

Augmented reality, whereby computer-generated images are overlaid onto the physical environment, is becoming significant part of the world of education and training. Little is known, however, about how these external images are treated by the sensorimotor system of the user – are they fully integrated into the external environmental cues, or largely ignored by low-level perceptual and motor processes? Here, we examined this question in the context of the size–weight illusion (SWI). Thirty-two participants repeatedly lifted and reported the heaviness of two cubes of unequal volume but equal mass in alternation. Half of the participants saw semi-transparent equally sized holographic cubes superimposed onto the physical cubes through a head-mounted display. Fingertip force rates were measured prior to lift-off to determine how the holograms influenced sensorimotor prediction, while verbal reports of heaviness after each lift indicated how the holographic size cues influenced the SWI. As expected, participants who lifted without augmented visual cues lifted the large object at a higher rate of force than the small object on early lifts and experienced a robust SWI across all trials. In contrast, participants who lifted the (apparently equal-sized) augmented cubes used similar force rates for each object. Furthermore, they experienced no SWI during the first lifts of the objects, with a SWI developing over repeated trials. These results indicate that holographic cues initially dominate physical cues and cognitive knowledge, but are dismissed when conflicting with cues from other senses.

Design of Invention-Based Student Activity Sheets Technology to Improve Learning Outcomes of Cube and Block Volume

This study aims to describe the characteristics of discovery learning activity sheet design for students, especially in class V SD Negeri Sukoharjo 01. The design of student activity sheets to improve student learning outcomes This study uses the Research and Development (R&D) method. describes the ten steps of conducting the research. However, in this study, due to time and cost limitations, the researcher simplified it into 7 steps, stage (1) potential and problems; (2) data collection; (3) product design; (4) design validation; (5) design revision; (6) product testing; (7) product revision. The design characteristics are based on the needs analysis of students ′worksheets. The analysis of the needs of students’ worksheets will be carried out on 50 students in grade 5 as the experimental class and 40 students in the control class. Collecting data using a questionnaire on student activity sheets and student learning outcomes tests. Based on the validator test, the material expert team and discovery learning activity sheet media of students were feasible to use in learning. The next stage is to determine the effectiveness of the student activity sheet by conducting a large group field test of the experimental class in class V SDN Sukoharjo 01 and SDN Sukoharjo 03.

REACT strategy toward mathematical communication abilities of madrasah ibtidaiyah students

Mathematical communication skills are one of the important future competencies possessed by students. Based on a preliminary study conducted on students in one of the Madrasah Ibtidaiyah shows that most students have difficulty communicating mathematical ideas. This study aims to figure out students’ mathematical communication skills on the subject of the volume of cubes and cuboids for the students taught withe the Relating, Experiencing, Applying, Cooperating and Transferring (REACT) strategy were better than those who taught with conventional learning. The research method used was a quasi-experimental design of The Nonequivalent Pretest-Posttest Control Group Design conducted on fifth grade students in one of the Ibtidaiyah Madrasahs in Bandung Regency. Based on the results of the study concluded that the mathematical communication skills of students who get learning with REACT strategies are better than mathematical communication skills of students who obtain conventional learning.

A study on non destructive evaluation of AA2024 by using different moulding sands by CO2 casting process

A rapid growth in the manufacturing industries especially casting industries required rapid quality measuring techniques to maintain the quality standards as well to increase the production rate. Non destructive evaluation (NDE) technique is a one of the major technique used in the manufacturing industries for maintaining it. By using NDE technique, it was easy to find and analyse the data if there were any internal, external and subsurface defects in the cast products. In the present study, four different shapes of casting (Cube, Flat Plate, Cylinder and Circular Plate) of same volume were taken to examine it through non destructive evaluation techniques namely – Visual Inspection, Liquid Penetrant Testing, and Radiography through three different moulding sands (Silica sand, Blast furnace slag and Ferro chrome slag) to analyse the best suitable moulding sand for different shapes. Also, different shapes of casted products reacts differently with different moulding sands in solidification changes which results in the surface quality which was defect free surfaces. Here, the main focus was on effect of four different shape of the components on the three different moulding sands to produce defect free surfaces. AA 2024 material was used for the present study and the casting technique used was CO2 Process. Results revealed that, in visual Inspection there was no visible defect observed in machined parts. Liquid penetration testing reveals that after machining some pores were observed in few places which were not effective defect to show any impact on the surface quality or the properties of the casts. No major surface defects were observed. Radiography Testing resulting in no visible internal defect was observed on all the components.

Optical Coherence Tomography (Angiography) Biomarkers in the Assessment and Monitoring of Diabetic Macular Edema.

Retinopathy is one of the most severe diabetes-related complications, and macular edema is the major cause of central vision loss in patients with diabetes mellitus. Significant progress has been made in recent years in optical coherence tomography and angiography technology. At the same time, various parameters have been attributed the role of biomarkers creating the frame for new monitoring and treatment strategies and offering new insights into the pathogenesis of diabetic retinopathy and diabetic macular edema. In this review, we gathered the results of studies that investigated various specific OCT (angiography) parameters in diabetic macular edema, such as central subfoveal thickness (CST), cube average thickness (CAT), cube volume (CV), choroidal thickness (CT), retinal nerve fiber layer (RNFL), retinal thickness at the fovea (RTF), subfoveal choroidal thickness (SFCT), central macular thickness (CMT), choroidal vascularity index (CVI), total macular volume (TMV), central choroid thickness (CCT), photoreceptor outer segment (PROS), perfused capillary density (PCD), foveal avascular zone (FAZ), subfoveal neuroretinal detachment (SND), hyperreflective foci (HF), disorganization of the inner retinal layers (DRIL), ellipsoid zone (EZ), inner segment/outer segment (IS/OS) junctions, vascular density (VD), deep capillary plexus (DCP), and superficial capillary plexus (SCP), in order to provide a synthesis of biomarkers that are currently used for the early diagnosis, assessment, monitoring, and outlining of prognosis.

The effectiveness of CLIS learning models on the results of mathematics learning about volume of cubes and beams in grade 5

Penelitian ini bertujuan untuk mengetahui keefektifan model pembelajaran CLIS (Children Learning in Science) terhadap hasil belajar matematika siswa kelas V sekolah dasar. Penelitian ini menggunakan metode eksperimental dengan True Experimental Design dengan jenis penelitian Posttest-Only Control Design. Penelitian ini dilakukan pada siswa kelas V SDN Randusongo 1 sebagai kelas eksperimen yang berjumlah 20 siswa. Penelitian ini dilakukan dengan memberikan perlakuan dengan model pembelajaran CLIS di kelas V SDN Randusongo 1. Teknik pengumpulan data menggunakan tes dan observasi. Analisis data posttest menunjukkan bahwa hasil tes kelas eksperimen lebih tinggi daripada kelas kontrol. Berdasarkan uji t dapat diketahui nilai uji t sebesar 1,868 sedangkan t tabel dengan derajat kebebasan 38 dan taraf signifikan 5% diperoleh hasil t tabel 1,686. Jika T-hitung = 1,868 > T-tabel = 1,686 maka H0 ditolak dan H1 diterima. Dengan demikian, dapat disimpulkan bahwa hasil penelitian ini adalah model pembelajaran CLIS yang efektif terhadap hasil belajar matematika kelas V SD.

Kemampuan Koneksi Matematis Peserta didik pada Pembelajaran Bangun Ruang dengan Strategi REACT Kelas VIII.A MTs Pancasila Kota Bengkulu

One of the objectives of mathematics learning is to improve the mathematical connection abilities on students. However, our observations showed that the mathematical connection abilities on students at MTs Pancasila, Bengkulu was still poor. This encourages the need for a learning strategy which is able to direct students to connect with what they have learned into everyday lives. Therefore, this study aimed to examine students’ ability in understanding mathematical concepts to solve problems related to cubes and rectangular prism topic. This was qualitative study with the REACT strategy. Cubes and rectangular prism was one of the mathematics topics of the basic competencies which have to be mastered by students in grade VIII. The subjects were 20 students who took the test and seven students who were randomly selected to be interviewed. Data collection included test of understanding the concept in essay form which was previously validated. Based on the results of students’ answers, 20 students have been able to connect between mathematics problems with the learned mathematics topic, the density topic in physics with the volume cube topic, and the question problems with everyday issues. However, it was also found that some students answered the questions with different procedures.

Study Based on the Early Mathematical Ability of Elementary Student Self-efficacy through the Concrete-Pictorial-Abstract Approach

Self-efficacy (SE) can encourage students to complete their assignments. The research intended to investigate the achievement of students' self-efficacy by guiding concrete-pictorial-abstract (CPA) based on early mathematical ability (EMA). The research utilized quasi-experimental methods in learning mathematics regarding the volume of cubes and rectangular prisms. The population were all fifth-grade students of elementary schools in Purwakarta, Subang, Karawang, and Bekasi. Samples were 119 participants in Karawang. The instruments applied were questionnaires, tests, and daily journals. The prerequisite materials related to the volume of cubes and rectangular prisms are a topic about arithmetic calculation, square root, flat area, unit length, and problem-solving. Study’s result informed that there was no significant difference in the achievement of students' self-efficacy through CPA and conventional mentoring in the high and moderate EMA groups. There was a significant difference in the achievement of students' self-efficacy in the low group given CPA and conventional guidance. This finding gave birth to a strategy of developing self-efficacy in elementary schools using the CPA approach, especially the use of concrete objects around students through mentoring activities in schools, considering that self-efficacy makes it easy to solve problems especially when it comes to students with low initial abilities.

THE INFLUENCE OF ROBOT DANBO MEDIA ON THE MATHEMATIC REPRESENTATION ABILITY OF PRIMARY SCHOOLS

The background of the problem in this study is the low mathematical representation ability of class V students. The media used to improve students' mathematical representation abilities is using the robot danbo media. volume of cubes and blocks in grade V students. This study aims to determine the effect of using danbo robot media on the mathematical representation ability of class V students in learning the volume of cubes and blocks in class V. The research method used is the one group pretest-posttest design method (one group pretest-posttest design) in Class V students. This research data was collected through the pretest and posttest scores of mathematical representation abilities with a total of 6 students, after being treated using the robot danbo media. The ability of students' initial understanding before treatment (pretest) obtained an average value of 65.3 while after treatment (posttest) was 86.1. It can be seen from the results of data processing using the t test with a confidence level of 95% (α = 0.05). It can be seen that the tcount is 3.4 and the ttable is 2.5706. So that H_0 is rejected, meaning that there is an effect of using danbo robot danbo media on the mathematical representation ability of the volume of blocks and cubes in class V.

Study on the mechanism of volume expansion and texture formation of apple cube dried by instant controlled pressure drop drying (DIC)

Abstract In order to control the quality of the DIC dried food products, this study investigated the energy conversion and the expansion force generation mechanism at the instantaneous pressure drop during the DIC treatment. Their effects on the product texture formation were analyzed. The results showed that the instantaneous vaporization of water at the moment of decompression could generated the expansion energy, which caused the expansion of the internal pores of the apple cube. Hence the volume and absolute porosity of the apple cube were increased. In addition, the pore walls of apple cube with the transition moisture content of 1.068 g/g (d.b.) were collapsed after DIC. Furthermore, DIC apple cube products had the optimal volume expansion ratio (2.317 ± 0.310), hardness (139.44 ± 16.52 N) and crispness (90 ± 17) at the transition moisture content of 0.152 ± 0.018 g/g (d.b.).

Prediabetes influences the structure of the macula: thinning of the macula in the Northern Finland Birth Cohort

Background/AimThe aim of this study was to evaluate the effect of prediabetes and diabetes on macular thickness and retinal vascular calibres in our population-based cohort (Northern Finland Birth Cohort).MethodsThe population...

The Role of Progressive Mathematics in Geometry Learning

The purpose of this study is to analyze the learning trajectory that can help students understand the concept of volume cubes and beams with filling and arrangement boxes using dice context in grade VIII of junior high school (SMP). This research is a design research type of validation study that is implemented through Realistic Mathematics Education (RME). Design research is carried out in three stages, namely: preliminary design, teaching experiment consisting of cycle one and cycle 2, and retrospective analysis. The study was conducted in grade VIII of SMP at Tangerang City. The results of the study show that students can understand the volume of cubes and beams through progressive mathematical identified at the situational stage, recognizing the volume unit with the arrangement of unit cubes; referential stage, calculates the number of unit cubes that can be made on cubes and beams; general stage, found the capacity of objects in the form of cubes or beams based on known ribs and blocks; formally stage, calculate the volume of cubes and beams if the ribs are known.

PENERAPAN MODEL TIPE THINK PAIR SHARE (TPS) DALAM MENINGKATKAN HASIL BELAJAR MATEMATIKA MATERI VOLUME KUBUS DAN BALOK SISWA KELAS V SEMESTER 2 DI SDN 1 RARANG SELATAN TAHUN PELAJARAN 2021/2022

The use of the Think Pair Shar (TPS) Cooperative Model in Improving Mathematics Learning Outcomes on the volume of cubes and blocks for Class V Semester 2 students at SDN 1 Rarang Selatan in the 2021/2022 academic year. This study aims to: (1). Knowing student learning outcomes through the application of the TPS Model in Mathematics learning (2) knowing student activities through the application of the TPS Model in Mathematics learning. This research was conducted in the form of Classroom Action Research. The stages carried out are: Action Planning, Action Implementation, Evaluation/Observation and Reflection. The subjects of this study were 12 students of class V semester 2 of the 2021/2022 academic year. The research data are: (1). Student learning outcomes were collected through learning outcomes tests. (2). Student activities were collected through observation guidelines. Data were analyzed descriptively qualitatively. From the results of data analysis found that: (1). The mean of student learning outcomes is 73.60. Classical completeness is 91.67% (2). Student activity in participating in learning increased at each meeting. Based on the results of the data above, the application of the Think Pair Shar (TPS) Type Model can be used as a strategy in the learning process.

Mathematical Critical Thinking Skill of Madrasah Ibtidaiyah Students On Cubes and Beam Volumes Material

This research-based on the findings that elementary school students already have mathematical critical thinking skills but have not reached the whole stage of the skills. Critical thinking skills of mathematics is essential for students because critical mathematical thinking can solve the problems and as a consideration to make decisions. This research aims to: (1) explore the critical thinking skills of mathematics of the subject of the volume of cubes and beams; (2) to determine student's difficulties in solving mathematical critical thinking skills test questions on the subject of the volume of cubes and beams. The research used a case study method of 28 students in one of the Islamic elementary schools in Bandung Regency. The data collected in the form of qualitative data obtained through tests of mathematical critical thinking skills, interviews, and document analysis. Data analysis techniques used thematic analysis by analyzing students' learning trajectory. The results showed that most students were still in the low category in the ability of critical thinking. As for the difficulties experienced by students, namely in providing simple explanations and working on problems that are not systematic. For this reason, the improving of students' mathematical critical thinking skills need further research.

APPLICATION OF DISCUSSION LEARNING MODEL USING ARCS MOTIVATION STRATEGY TO IMPROVING STUDENT LEARNING OUTCOME

AbstractSeveral factors can causes a low student learning outcomes in mathematics. One of them is lack of motivation in learning so students are not enthusiastic in learning seen from students who tend to be embarrassed or afraid to ask questions, lack of responding to the teacher, and less responding to the teacher's explanation. Therefore, the importance of innovative learning and motivation can help students get the optimal learning process. This study aims, to describe the effectiveness of learning and improving student learning outcomes through discussion learning with ARCS motivation strategy about the surface area and volume of cube in 8th grade of junior high school. This study use a quantitative descriptive study using one group pretest-post test study. The subject of this study are student of VIII-B in SMPN 2 Wonoayu with a total of 32 students. Data collection’s methods are using tests (pretest and post test), questionnaires and observations. Data were analyzed descriptively quantitatively. To find out the increase in student learning outcomes in VIII-B class, the data were analyzed using n-gain. The results of this study include the ability of teachers to manage learning including good categories, students activities including active categories with an average percentage of 99.98 %, the response of students included in the good category with a percentage of 100%, completeness student learning there are 28 students completed with a percentage of 87,50% and increased student learning outcomes including the medium category. Based on the results of the research data, the implication of the results of this study is the determination of appropriate learning models and strategies can be used to improve student learning outcomes. This is indicated by the gain score obtained by students belonging to the medium category. The use of the discussion learning model in this study is said to be effective because it has fulfilled 4 components, namely student learning activities, student responses, student learning completeness and increased student learning outcomes.Keywords: discussion, ARCS motivation, result of learning

Students’ Mental Construction in Cube and Cuboid Concepts Based on Mathematical Ability Differences

Understanding of cube and cuboid concepts is one of the essential goals of solid geometry learning. Most studies of students’ understanding of these concepts have posited a gap between the students’ surface area and volume conceptions of its and students’ understanding. The study aims to describe the students’ mental constructions in APOS (Action, Process, Object, and Schema) theory framework. This study used analysis of students as subject to three junior high school students who have differences in mathematical abilities with a qualitative approach. Data were collected by the task sheet and interview. The result of this study evidences that subject who has high mathematical ability could solve problems about cube and cuboid concepts correctly in the action stage. In the process and object stage, subject could provide detailed explanations of how steps to assess the surface area and volume of cube and cuboid. She compared two shapes with different sizes of cube and cuboid. In the schema stage, she made systematic understanding related to the concepts of surface area and volume of cube and cuboid. The subject who has medium mathematical ability explained her mental construction in action and process stage well, despite the error in the process stage. Next stage, she had compared two different shapes of cube and cuboid to found their ratio. The last stage, she had not completed her explanation. The subject has low mathematical ability could solve the problems about cube and cuboid concepts. At the process, object, and schema stage, she had not completed its indicators to show cube and cuboid concepts.

High-Speed, Ultrahigh-Resolution Spectral-Domain OCT with Extended Imaging Range Using Reference Arm Length Matching.

PurposeTo develop high-speed, extended-range, ultrahigh-resolution spectral-domain optical coherence tomography (UHR SD-OCT) and demonstrate scan protocols for clinical retinal imaging.MethodsA UHR SD-OCT operating at 840-nm with 150-nm bandwidths was developed. The axial imaging range was extended by dynamically matching reference arm length to the retinal contour during acquisition. Two scan protocols were demonstrated for imaging healthy participants and patients with dry age-related macular degeneration. A high-definition raster protocol with intra–B-scan reference arm length matching (ReALM) was used for high-quality cross-sectional imaging. A cube volume scan using horizontal and vertical rasters with inter–B-scan ReALM and software motion correction was used for en face and cross-sectional imaging. Linear OCT signal display enhanced visualization of outer retinal features.ResultsUHR SD-OCT was demonstrated at 128- and 250-kHz A-scan rates with 2.7 µm axial resolution and a 1.2-mm, 6-dB imaging range in the eye. Dynamic ReALM was used to maintain the retina within the 6-dB imaging range over wider fields of view. Outer retinal features, including the rod and cone interdigitation zones, retinal pigment epithelium, and Bruch's membrane were visualized and alterations observed in age-related macular degeneration eyes.ConclusionsTechnological advances and dynamic ReALM improve the imaging performance and clinical usability of UHR SD-OCT.Translational RelevanceThese advances should simplify clinical imaging workflow, reduce imaging session times, and improve yield of high quality images. Improved visualization of photoreceptors, retinal pigment epithelium, and Bruch's membrane may facilitate diagnosis and monitoring of age-related macular degeneration and other retinal diseases.

Fluctuations in Macular Thickness in Patients with Retinal Vein Occlusion Treated with Anti–Vascular Endothelial Growth Factor Agents

To evaluate macular thickness fluctuations in patients with retinal vein occlusions (RVOs) treated with anti-vascular endothelial growth factor (VEGF) agents and to assess whether patients with larger fluctuations have poorer visual outcomes. Retrospective cohort study. Treatment-naive patients with RVO. Central subfield thickness (CST), cube volume (CV), and cube average thickness (CAT) were collected from OCT images obtained at baseline and 3, 6, 9, and 12 months, and standard deviations (SDs) across 12 months were calculated. Mixed-effects regression was performed to examine the relationship between macular thickness SD and 12-month visual acuity (VA). Standard multiple regression was performed to identify predictors of macular thickness SD. Standard deviations across 12 months for CST, CV, and CAT and VA at 12 months. One hundred thirty-four eyes, including 71 with branch RVO (BRVO) and 63 with central RVO (CRVO), were evaluated. Mean baseline and 12-month CST were 488.6 ± 165.0 μm and 334.3 ± 131.9 μm (change, -154.3 ± 210.2 μm; P < 0.001), with CST SD of 114.1 ± 77.0 μm. Baseline and 12-month VA were 52.8 ± 20.9 letters and 65.9 ± 17.3 letters (change,+13.1 ± 20.3 letters; P < 0.001). Central subfield thickness SD was a significant negative predictor of 12-month VA (-5.21 letters/100 μm; 95% confidence interval [CI], -10.21 to -0.22 letters/100 μm; P= 0.041) when adjusting for baseline factors and injections. Baseline CST and number of injections were not predictive (P ≥ 0.101). Stratification by CST SD demonstrated a 10-letter difference in 12-month VA between the first and fourth quartiles. Baseline CST and RVO diagnosis were the only significant predictors of CST SD (CRVO vs. BRVO:+34.64 μm/100 μm [95% CI, 29.33-39.94 μm/100 μm; P < 0.001] and+22.13 μm/100 μm [95% CI, 4.81-39.44 μm/100 μm; P= 0.013]). Associations using CV and CAT were similar. Larger macular thickness fluctuations are associated with poorer visual outcomes in patients with RVO treated with anti-VEGF agents. Macular thickness fluctuations, in addition to absolute macular thickness, may be an important prognostic biomarker in these patients.

PENINGKATAN AKTIVITAS DAN HASIL BELAJAR MATEMATIKA MATERI VOLUME KUBUS DAN BALOK DENGAN MODEL INKUIRI

This study aims to improve the activities and results of mathematics learning through the application of guided inquiry models in class V SDN 009 Sangatta Utara. This research is motivated by the low activity and learning outcomes of students in grade V SDN 009 North Sangatta. The results showed that the teacher's activity in learning mathematics about the volume of cubes and beams through the guided inquiry model in cycle I was 48% with moderate criteria, increasing to 71% in cycle II classified as medium criteria and cycle III being 90% classified as high criteria. Student activity at the first meeting showed 28%, the second meeting showed 39%, the third meeting showed 54%, the average value of the activity of the first cycle students showed 40% with low criteria. After an improvement, there was an increase in cycle II, in the second cycle the first meeting of students' activities showed 53%, the second meeting showed 64%, the third meeting showed 78%, the average value of the activities of cycle II students showed 65% with moderate criteria. In the third cycle there was also an increase in the third cycle the first meeting showed 78% student activity, the second meeting showed 89%, the third meeting showed 94%, the average value of the activity of the first cycle showed 87% classified as high criteria. This increase occurs where students always pay attention to their weaknesses and try to improve it seen in the stages of the cycle that there is always an increase. Increased student activity can also affect the increase in student learning outcomes that show an average percentage of cycle I by 53%, cycle II by 68% and cycle III by 79%. From the results of the study showed that the guided inquiry model can increase the activity and learning outcomes of mathematics in class V SDN 009 North Sangatta.

The qualitative assessment of optical coherence tomography and the central retinal sensitivity in patients with retinitis pigmentosa.

To analyze the relationships between qualitative and quantitative parameters of spectral-domain optical coherence tomography (SD-OCT) and the central retinal sensitivity in patients with retinitis pigmentosa (RP). Ninety-three eyes of 93 patients were finally enrolled, with a median age (quartile) of 58 (24.5) years. We assessed the patients using SD-OCT and the 10-2 program of a Humphry Field Analyzer (HFA). As a qualitative parameter, two graders independently classified the patients' SD-OCT images into five severity grades (grades 1-5) based on the severity of damage to the photoreceptor inner and outer segments (IS/OS) layer. As quantitative parameters, we measured the IS-ellipsoid zone (IS-EZ) width, IS/OS thickness, outer nuclear layer (ONL) thickness, central macular thickness (CMT, 1 and 3 mm) and macular cube (6 × 6 mm) volume and thickness. The central retinal sensitivity was defined by the best-corrected visual acuity (BCVA; logMAR), average sensitivities of the central 4 (foveal sensitivity [FS]) and 12 (macular sensitivity [MS]) points of the HFA 10-2 program and the mean deviation (MD) of the 10-2 program. Spearman's correlation was used to assess the association between both qualitative and quantitative parameters and variables of the central retinal sensitivity. In addition, we performed a multiple regression analysis using these parameters to identify the parameters most strongly influencing the central retinal sensitivity. The IS/OS severity grade was significantly correlated with the BCVA (ρ = 0.741, P < 0.001), FS (ρ = -0.844, P < 0.001), MS (ρ = -0.820, P < 0.001) and MD (ρ = -0.681, P < 0.001) and showed stronger correlations to them than any other quantitative parameters including the IS-EZ width, IS/OS thickness, ONL thickness, CMTs and macular cube volume/thickness. Furthermore, a step-wise multiple regression analysis indicated that the IS/OS severity grade was more strongly associated with the BCVA (β = 0.659, P < 0.001), FS (β = -0.820, P < 0.001), MS (β = -0.820, P < 0.001) and MD (β = -0.674, P < 0.001) than any other quantitative parameters. The intraclass correlation coefficient between two graders indicated substantial correlation (κ = 0.70). The qualitative grading of OCT based on the severity of the IS/OS layer was simple and strongly correlated with the central retinal sensitivity in patients with RP. It may be useful to assess the central visual function in patients with RP, although there is some variation in severity within the same severity grade.