[Retinal image quality in northern rural Chinese adult population].

Objective: To assess the retinal image quality of the normal northern rural Chinese adult population. Methods: A normal population-based, cross-sectional study. From Oct, 2012 to Jan 2013, a clustered, random sampling procedure was used to select normal population who visual acuity≤ 0(LogMAR) and 30-69 years old from 2 villages. All eligible subjects were invited to undergo a comprehensive eye examination, and the retinal image quality related index were examined with pupil 4 mm using objective optical quality analysis systemⅡ(OQAS Ⅱ, Visiometrics, Spain), including MTFcutoff, VA20, VA9, PSF50, PSF10, OSI, SR. And describe the retinal image quality of different age group, including 30-39y, 40-49y, 50-59y, 60-69y. Results: Among 1 108 participants (61.9%) that completed examinations in our center, 681 participants (1 362 eyes) were recruited. There were 146, 586, 440 and 190 eyes in each group. The spherical equivalent refraction of each group was (-0.35±0.84), (-0.19±0.50), (-0.03±0.54) and (0.20±0.71) D. The best corrected vision acuity of each group was -0.02±0.04, -0.01±0.03, -0.01±0.02 and -0.00±0.01. The MTFcutoff of each group was (37.06±9.31), (36.69±8.93), (36.52±9.05) and (32.61±10.08) c/deg. Retinal imaging parameters were significantly different(MTFcutoff: MD= 4.45, SR: MD= 0.03, PSF50: MD= -0.45, PSF10: MD= -2.87, VA20: MD= 0.13, A9: MD= 0.09, OSI: MD= -0.41, P< 0.001)between aged 30-39 group and aged 60-69 group. Objective scattering index (OSI) were significantly different( MD= -0.13, P= 0.004)between aged 30-39 group and aged 50-59 group. Retinal imaging parameters were significantly different(MTFcutoff: MD= 4.45, SR: MD= 0.03, PSF50: MD= -0.45, PSF10: MD= -2.87, VA20: MD= 0.13, VA9: MD= 0.09, OSI: MD= -0.41, P< 0.001)between aged 40-49 group and aged 60-69 group. Retinal imageing parameters were significantly different(MTFcutoff: MD= 4.45, SR: MD= 0.03, PSF50: MD= -0.45, PSF10: MD= -2.87, VA20: MD= 0.13, VA9: MD= 0.09, OSI: MD= -0.41, P< 0.001)between aged 50-59 group and aged 60-69 group. Conclusion: Retinal image quality was gradually worse over time in the northern rural Chinese adult population. (Chin J Ophthalmol, 2018, 54:593-598) .