Emde C W, Brewitt H, Winter R
Augenklinik der Medizinischen Hochschule Hannover.
Klin Monbl Augenheilkd. 1996 Jun;208(6):431-7. doi: 10.1055/s-2008-1035260.
Computer-controlled video keratoscopy is being employed ever more frequently and for various indications.
We have studied the effects of high-viscosity and low-viscosity tear substitutes on the corneal topography, one and five minutes after application to 14 normal eyes of 7 subjects, and compared the results.
In contrast to low-viscosity preparations, high-viscosity preparations cause an appreciable increase in astigmatism and an alteration of the axis shortly after application. The variations caused by low-viscosity tear substitutes lie within the normal range of variation between several measurements.
At least in the case of the normal eye, gels should not be applied immediately before keratometry. In the case of patients who have undergone keratoplasty, however, it can be helpful before fitting contact lenses. In addition keratometry can be helpful to determine the residence time of ophthalmic preparations being different in viscosity.
计算机控制的视频角膜地形图检查正越来越频繁地应用于各种适应症。
我们研究了高粘度和低粘度泪液替代物对7名受试者14只正常眼睛应用后1分钟和5分钟角膜地形图的影响，并比较了结果。
与低粘度制剂相比，高粘度制剂在应用后不久会导致散光明显增加和轴位改变。低粘度泪液替代物引起的变化在几次测量之间的正常变化范围内。
至少在正常眼的情况下，凝胶不应在角膜曲率测量前立即应用。然而，对于接受角膜移植手术的患者，在佩戴隐形眼镜前可能会有帮助。此外，角膜曲率测量有助于确定不同粘度眼科制剂的停留时间。
