Discrepancies between total and anterior corneal high-order aberrations at measured and theoretical pupil diameter

Abstract

AIM: To compare the difference between total and anterior corneal high-order aberrations(HOA)calculated based on the pupil diameters of 4.0mm and the actual measurements in different age groups.METHODS: A cross sectional study. A Total of 100 subjects between March, 31th and May, 31th in 2019 were included. Their total corneal high-order aberrations(THOA)and anterior corneal high-order aberrations(AHOA)were detected on the basis of different machine-provided pupil diameters(2.0-7.0mm)and their photopic pupil diameters were recorded as measured pupil diameters in the room with normal illumination. THOA and AHOA based on the machine-measured pupil diameter was calculated through fitting curves, and compared to the THOA and AHOA at a theoretical 4mm pupil diameter.RESULTS: The measured pupil diameter was negatively correlated with age(r= -0.587, Pr= -0.191, P=0.002; r=-0.181, P=0.004). At 4mm pupil diameter, THOA was positively correlated with age(r=0.282, PPPP=0.006), but higher than AHOA in 60-69 years old groups(P=0.039). In the aged group(include 60-69 and 70-79 years old groups), the proportion of observed value of THOA ≥0.3μm at the measured pupil diameters were significantly lower than those at 4mm pupil diameter(χ2=4.300, P=0.038).CONCLUSION: THOA and AHOA at the measured pupil diameters in the old subjects are significantly lower than those at 4mm pupil diameter, which could be ascribed to their relatively small actual mean pupil sizes. Our study suggested that the THOA rather than AHOA should be used for the selection of multifocal intraocular lens for cataract patients at measured pupil diameter, so that more aged patients will satisfy the inclusion criteria.

Keywords

• cornea
• high-order aberration
• pupil diameter