Abstract:

The main reason of decreased visual acuity after keratoconus is most likely high irregular astigmatism. A successful gas\|permeable contact lens (RGPCL) fitting is not easy for those patients with extremely irregular corneal surface. The purpose of this review is to explore the individual RGPCL fitting for these special cases, and to analyze the latest developments and progress in this field through literature retrieval. The RGPCL fitting software programs based on corneal topography have been introduced. It will increase efficiency in fitting RGP. The current 3D printing technology has reached a high accuracy, which can accurately construct solid model of corneal anterior surface to meet the RGP simulation fitting requirements. According to the theoretical analysis and preliminary experimental results, RGPCL simulation fitting in 3D printing technology had a good feasibility and practicability.  (Int Rev Ophthalmol, 2019, 43:  89-93)