Characteristics and distributed rules of peripheral retinal degeneration in the eye with high myopia

Objective:To discuss characteristics and distributed rules of peripheral retinal degeneration in the eye with high myopia.Methods:Nine hundred and eighty four eyes of 503 cases with myopia were examined.They were divided into 3 groups:group 1 of diopter of myopia-3.00DS;group 2 of diopter of myopia from -3.00DS to -6.00DS and group 3 of di- opter of myopia-6.00DS.The methods of examination included in noncycloplegic and cycloplegic refraction,and direct ophthalmoscope and slit-lamp microscopy combined with three-mirror contact lens or panretinoscope.Quantity,characteris- tics and distributed rules of peripheral retinal degeneration were recorded and analyzed.Results:The mean refraction degree of 984 eyes was (-6.56±5.70)DS.Of 984 eyes,155 eyes had peripheral retinal degeneration (15.75%),with 19 cases of the changes in unbilateral eye was (10.98%) and 73 cases in bilateral eyes (89.02%).Incidence rates of peripheral retinal degenerations were 17.42%,33.54% and 49.04% in three groups respectively.There was a symmetry in distribu- tion of peripheral retinal degeneration in bilateral eyes of 47 cases (60.65%).Most of the lesions were found in the periph- eral retina of temporal quadrants,and the prevalence of lesions in both superior and inferior quadrants was nearly similar. The most common peripheral retinal lesions were white without pressure and branch degeneration,which were followed by lat- tice degeneration and retinal hole.Conclusion:There is a high prevalence of peripheral retinal degenerations in the eye with high myopia,and a symmetry in bilateral eyes.There is significant difference in relevance ratio for peripheral retinal degen- erations among the different diopter groups,and the ratio increases with the increase of myopia diopter.So the features are valuable in diagnosis,treatment and prognosis of high myopia.