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HIGH MYOPIA AND DIABETIC RETINOPATHY: A Contralateral Eye Study in Diabetic Patients With High Myopic Anisometropia
Nooshin Bazzazi1, Siamak Akbarzadeh, Minoo Yavarikia
1*Department of Ophthalmology, Farshchian Teaching Center, Hamadan University of Medical Sciences, Hamadan, Iran; †Department of Epidemiology, Hamadan University of Medical Sciences, Hamadan, Iran; and ‡Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Purpose:
To examine an association between high myopia and diabetic retinopathy (DR) in diabetic patients with high myopic anisometropia.
Methods:
A total of 116 white diabetic patients (232 eyes) with high myopia (spherical equivalent > -5.00 diopters, D) anisometropia (difference ≥ -6 D) were enrolled in this cross-sectional, contralateral eye study. The frequency of DR was compared between the high myopic and the contralateral eyes.
Results:
Compared with the fellow eyes, DR was significantly less frequent in high myopic side (27.6% vs. 100%, P < 0.001; relative risk, 0.28 with 95% confidence interval of 0.21-0.37). Similar significant trends were found for the incidence of nonproliferative (27.6% vs. 69%, P < 0.001) and proliferative DR (0% vs. 31%, P < 0.001). Diabetic retinopathy was also less severe in the same group.
Conclusion:
Using a contralateral eye study design prevented the influence of potential confounding factors inherent in similar previous case-control studies. On this basis, a protective role for high myopia against DR was established.
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