论文部分内容阅读
1引言当眼镜处方超过6.00D时,得将角膜至镜片的距离——顶点距离考虑进去。无论正镜还是负镜,对于较高的屈光度,顶点距离都至关重要,因为屈光度高的镜片顶点距离的微小变化都会使投射在视网膜上的物像清晰度大为改变。如果为一位无晶体眼患者(白内障手术摘除晶体)验光,可能他的处方度数在+11.00D～+17.00D之间,对于这类患者,有必要根据适当的顶点距离调整镜片度数。
1 Introduction When prescription glasses over 6.00D, the distance from the cornea to the lens - vertex distance into account. Neither the positive nor the negative mirror is critical for higher dioptric powers because the small changes in vertex distance of the dioptric lens will greatly change the sharpness of the image projected on the retina. If a patient with aphakia (cataract surgery to remove the crystal) optometry, prescription may be his prescription degrees between +11.00 D ~ +17.00 D, for such patients, it is necessary to adjust the lens according to the appropriate vertex distance.