Dynamic Measurement of Refraction and Pupil Center Shift according to Illumination

Abstract

Purpose : The aim of this study was to evaluate the change of refraction and pupil center shift including direction and amounts according to the illumination. Methods : From July 2020 to September 2020, 58 eyes of 29 adults (14 males and 15 females) who had no experience with ophthalmic disease and corneal refractive surgery. The average age is 35.62±14.48 years. Using an aberration analyzer, the result of measuring the refraction according to the illumination, the change of the pupil center shift were used and the average value was measured three times each. The statistical program SPSS was used to analyze whether there was a difference between the change in myopia and the pupil center according to the illumination. Results : The spherical diopter according to the illumination changed from –2.80 D to –2.94 D increasing by –0.14 D (p<0.001). The cylindrical diopter increased from –0.93 D to –0.98 D, increasing by –0.05 D (p<0.001). The change of the pupil center shifted by an average of 0.14 mm (p<0.001) in the horizontal direction and 0.13 mm in the vertical direction (p<0.001). The shift of the pupil center by direction was 35 eyes (60.3%) on the superior, 20 eyes (34.5%) on the inferior, 25 eyes (43.1%) on the nasal, and 33 eyes (56.9%) on the temporal. The horizontal shift in both eyes had a high correlation (r=0.700) and there was a low correlation in the vertical direction (r=0.244). Conclusion : In the scotopic vision, the greater the spherical power in the (-) direction, and the pupil center shifted in both horizontal and vertical directions. Therefore, when preparing spectacle lenses for night activities, it is considered that the quality of visual acuity due to the shift of the pupil center should be considered.