Abstract
This study was aimed to quantitatively assess objective forward scattering and its relevant factors in eyes having cataract. Our study comprised 192 eyes of 192 patients (mean age, 71.3 ± 9.2 (standard deviation) years) who have cataract formation for surgical consultation. We determined uncorrected and corrected distance visual acuities (UDVA and CDVA), manifest refraction, the grade of nuclear sclerosis, objective scattering index (OSI) with the OQAS II (Visiometrics, Spain), log(s) with the C-Quant (Oculus, Germany), and ocular higher-order aberrations (HOAs) using the wavefront sensor (KR-1W, Topcon, Japan). The mean OSI was 5.11 ± 3.19 (0.90 to 20.90). We found explanatory variables relevant to the OSI to be, logMAR CDVA (p < 0.0001, partial regression coefficient B = 5.917) and log(s) (p = 0.0006, B = 0.911) (adjusted R2 = 0.333), in order of influence. No significant correlation was found with other clinical factors such as gender, age, manifest refraction, UDVA, ocular HOAs, or nuclear sclerosis. Eyes with worse CDVA and higher log(s) are more predisposed to show higher OSI in cataractous eyes. It is suggested that objective forward scattering was associated, not only with CDVA, but also with subjective forward scattering, in cataractous subjects.
Highlights
There are two commercially available devices for the evaluation of forward scattering in clinical use
No significant association with other clinical factors were found such as gender, age, manifest refraction, uncorrected and corrected distance visual acuity (UDVA), axial length, ocular higher-order aberrations (HOAs), or nuclear sclerosis
Our results show that the objective forward scattering was significantly associated with logMAR CDVA, as well as with subjective forward scattering, in eyes having cataract
Summary
There are two commercially available devices for the evaluation of forward scattering in clinical use. There have been several studies to evaluate this objective forward scattering and its relationship with visual acuity in eyes with cataract[6,7,8,9,10,11,12]. The relationship between subjective and objective forward scattering has not been fully elucidated in a large cohort of cataractous patients. It may give us intrinsic insights on the role of objective light scattering in visual degradation in such patients. The aim of the current study is twofold; to quantitatively evaluate objective forward scattering in eyes having cataract, and to determine the relevant factors influencing this scattering, using single and multiple regression analyses in such eyes
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