Ocular Pulse Amplitude and Its Relation to Myopia and Myopic Maculopathy
Resource
慈濟醫學雜誌 v.7 n.4 pp.277-283
Journal
慈濟醫學雜誌,v.7
Journal Issue
n.4
Pages
277-283
Date Issued
1995
Date
1995
Author(s)
SHIH, YUNG-FENG
HUANG, JAU-KANG
HUANG, SHEAU-HUEY
HO, TZYY-CHANG
LIN, LUKE, LONG-KUANG
HUNG, POR-TYING
HOU, PING-KANG
Abstract
Ocular pulse amplitude is expressed as the fluctuation of an intraocular pressure within each cardiac cycle, a phenomenon observed during measurement of intraocular pressure. The pulse is generated by the choroidal blood flow . Myopic maculopathy is characterized by thinning and atrophy of the retina and choroid, suggesting that choroidal blood flow may be an important factor contributing to it. We used Alcon Pneumotonography to study the ocular pulse amplitude of myopic patients and analyzed its correlations with myopia and myopic maculopathy. Totally 258 patients( 516 eyes) were included in this study. The results show that a decrease of ocular pulse amplitude correlated directly with increase of age, refractive error, axial length, the size of the crescent and the degree of myopic maculopathy. But, the change of ocular pulse amplitude did not correlated with the intraocular pressure. The greater of the myopia and the longer of axial length, the lower of ocular pulse amplitude and the more severe the maculopathy. Ocular pulse amplitude of less than 0.5mmHg is a high risk factor which can be used to predict the likelihood of myopic maculopathy. Thus, these results may indicate that a circulatory disturbance may cause the development of myopic maculopathy.