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The Relationship Between the Size of Optic Disc Crescent and Myopic Maculopathy

1996; Volume: 8; Issue: 3 Linguagem: Inglês

10.6440/tzucmj.199609.0205

Yung‐Feng Shih, Tzyy‐Chang Ho, Szu‐Yuan Lin, Luke L-K Lin, Pjor-Tying Hung, Ping‐Kang Hou,

Corneal surgery and disorders

Myopic maculopathy is one of the most severe complications of high myopia. The severity correlates with the increase of axial length, refractive error and age. Optic disc crescent formation was suggested to be an early sign of the degeneration of the posterior pole. Thus, evaluating the correlation between myopic maculopathy and the size of the disc crescent is needed. Analysis of 993 high myopic patients form the high myopic clinic at National Taiwan University hospital (NTUH)showed that the size of the disc crescenet was correlated with an increase in axial length and refractive error. The incidence of disc crescent greater than one disc diameter (DD) was also higher in groups with axial length longer than 29.0 mm, refractive error over -15.0 D and/or age older than 40 years. As well, 69.4% of patients with myopic maculopathy more severe than D1 had disc crescents larger than 1 DD; 78.5% of patients with myopic maculopathy more severe than D2 had disc crescents larger than 1 DD. If only the disc crescent larger than 1 DD was considered, 75.8% of the patients had D1 myopic maculopathy or more, and 56.4%of the patients had D2 myopic maculopathy or more. If both conditions with axial length over 29.0mm and disc crescent larger than 1 DD were considered together, then 86.5% of the patients had D1 myopic maculopathy or more. Further, if all of the conditions with axial length over 29.0 mm, subject’s age older than 40 years and disc crescent larger than 1 DD were considered together, 94.3% of the patients had D1 or more myopic maculopathy. Therefore, the size of the disc crescent could be one of the factors to predict the possibility of myopic maculopathy. (Tzu Chi Med J 1996; 8: 205-211)