Morgan J F
Can J Ophthalmol. 1975 Apr;10(2):207-13.
Changes in keratometer readings were measured in 87 patients, wearing hydrophilic contact lenses for three to more than eighteen months. Twenty-four eyes in the group had an increase of +0.75 or more in the keratometer readings, which invariably involved the vertical reading and was often associated with a distortion of the mire reflex. The change was high as +2.75 diopters. If greater than +1.00 diopter, it was associated with decreased visual acuity with forward correction and with the hydrophilic contact lenses. All but one of the patients who showedchanges of greater than +0.75 diopters over their baseline keratometer readings, were wearing their lenses on an average of 14-16 hours a day. The keratometer readings reverted to the baseline levels with a loss of the distrotion, if the patient reduced the wearing time to less than 12 hours daily. We believe that a maximum average daily wearing time of 12 hours is the safety limit required to minimize the development of induced corneal astigmatism.
对87名佩戴亲水性隐形眼镜3至18个月以上的患者测量了角膜曲率计读数的变化。该组中有24只眼睛的角膜曲率计读数增加了0.75或更高，这总是涉及垂直读数，并且经常与视标反射的扭曲有关。变化高达2.75屈光度。如果大于1.00屈光度，则与矫正视力下降以及佩戴亲水性隐形眼镜有关。在角膜曲率计读数超过基线水平0.75屈光度以上的患者中，除一人外，所有人平均每天佩戴镜片14至16小时。如果患者将佩戴时间减少到每天少于12小时，角膜曲率计读数会恢复到基线水平，视标反射的扭曲也会消失。我们认为，每天平均佩戴时间最长12小时是将诱发角膜散光的发展降至最低所需的安全限度。
