Study on the correlation between the visual acuity and the changes of retinal structure of the macular in eyes with contusion

Abstract

Objective To investigate the correlation between the visual acuity and the changes of retinal structure of the macular in eyes with contusion. Methods Sixteen eyes of 16 patients with ocular contusion were collected in this study. Frequency domain optical coherence tomography (SD-OCT) were used to measure the changes of shape and structure of the macular.The difference was observed between contusion eyes and contralateral normal eyes.The relationship between the degree of impaired BCVA and the foveal change was analysed. Results The average thickness of central macula in contusion eyes was thinner than in contral eyes, the difference was statistically significant(P=0.003). The difference in macular volume between contusion eyes and contralateral eyes was statistically significant(P=0.008, 0.001, 0.002, 0.017, 0.020, 0.010, 0.002, 0.014) in all other areas except the ring side, below the nose and temporal. Macular volume, macula paracentral inner ring volume and average central macular retinal thickness were negatively correlated with vision (P=0.000, 0.044, 0.008). Macular total volume showed no correlation with vision(P=0.194). The length of ellipsoid interrupted had a positive correlation with vision(P=0.043). Multiple linear regression analysis showed, visual acuity was drop with decreasing of the volume of macular (Y=-9.636X+ 2.471, R2=0.896, Rad2=0.878, P=0.000). Conclusion After ocular contusion, the changes of retinal morphology and structure such as macular volume, foveal thickness, the length of retinal internal reflection band are closely related to the degree of retinal damage. Macular retinal region volume can reflect the severity of the damage of visual function. Key words: Ocular contusion; Macular structure; Visual acuity; Tomography, optical coherence; Volume, retinal, central macular