The Effects Of Facial Morphology On UV Exposure In Eyes Of Both Sexes In Mongoloid And Caucasoid

Objective: Cataracts have long been one of the major causes of visual impairment,and the prevalence of cataracts is higher in women than in men,and UV radiation has been identified as one of the risk factors for cataracts.The purpose of this study was to explore the differences in eye UV radiation exposure between Mongoloid and Caucasoid sexes and its effects from facial morphology,so as to analyze the differences in cataract diseases between Mongoloid and Caucasoid men and women from the differences in facial morphology,and to provide a reference for the formulation of UV radiation protection strategies.Methods: Build the 3D facial model of both sex in Mongoloid and Caucasoid.A ocular UV exposure model was constructed to monitoring the ocular ultraviolet radiation in August 2019 in fuxin city,liaoning province(latitude 42.00 ° and 121.69 ° east longitude,46 meters).Comparing the ocular ultraviolet radiation between Mongoloid and Caucasoid race gender model under the different solar elevation angle(SEA)and the rotation angle.And using the IBM SPSS22.0 software and the method of two independent sample test to compare differences of the mean value of ocular ultraviolet radiation exposure between the sex‘s model.A quantitative description of the influence of facial morphology on the range of ocular light reception angle was established: Three-Dimensions Ocular Maximum Incident Angle of Direct Light was constructed.The effects of facial morphology on ocular UV radiation exposure were analyzed by stratification and multiple linear regression model.The ocular light exposure model was constructed based on the sunlight simulation system,and rendering to obtain and compare the difference of ocular gray value between model of Mongoloid and Caucasoid sexes.Results:The difference in ocular UVA average exposure in Mongoloid and Caucasoid gender model was statistically significant in solar elevation angle at 32.09-59.88° and 46.25–59.89° respectively.In these interval,the specific value of the ocular UVA average exposure of female to males was 1.07 and 1.08,respectively.The total average exposure intensity of ocular ultraviolet radiation in female models of Mongoloid and Caucasoid ethnic groups was 1.04 and 1.07 times that of male models,and the average gray value of ocular light exposure was 1.07 and 1.08 times that of male models,respectively.The regression coefficients of the 3D ocular maximum incident angle of direct light in the multivariate regression equation of the UV radiation exposure intensity of the Mongoloid and Caucasoid ethnic models are positive.And on the nasal side,the Mongoloid ethnic model has a statistically significant difference in the intensity of UV radiation exposure between the sexes caused by the 3D ocular maximum incident angle of direct light between the sexes.In the Caucasoid ethnic model,the difference in UV radiation exposure intensity between the sexes caused by the 3D ocular maximum incident angle of direct light between the sexes is statistically significant tends to be at high solar elevation angles.Conclusion: Ocular ultraviolet radiation exposure increases with the 3D ocular maximum incident angle of direct light.Since the 3D ocular maximum incident angle of direct light in female models is greater than that of males,the exposure of female ocular ultraviolet radiation is greater than that of men.The difference manifested on the nasal side is more obvious.The results of monitoring and the sunlight simulation rendering of this study consistently revealed the difference in ocular exposure between the sexes of the Mongoloid and Caucasoid race models reached a maximum in the solar elevation angle between 50 and 59°.