Abstract:

Objective To investigate the long term clinical effects of rigid gas permeable contact lens (RGPCL) control on adolescent myopia combined with high astigmatism. Design Retrospective case series. Participants 48 patients (69 eyes), with a mean age of (15.2±1.5) years with myopia combined with high astigmatism ( ≥-2.50 D) were fitted with RGPCL and followed up for 5 years. 51 patients (102 eyes),  with a mean age of (15.3±1.6) years with  myopia combined with high astigmatism ( ≥-2.50 D) were fitted with spectacles and followed up for 5 years. Methods For RGPCL group, after using tropicamide phenylephrine eye drops, the ocular refraction, corrected visual acuity and the radius of corneal curvature changes were observed for 5 years. For spectacles group, after using tropicamide phenylephrine eye drops, the ocular refraction, corrected visual acuity were observed for 5 years. The differences of the average sphere diopter, cylinder diopter, and corrected visual acuity were compared between RGPCL group and spectacle group.  Main Outcome Measures The average sphere diopter, cylinder diopter, corrected visual acuity, average horizontal radius, average vertical radius, average radius of corneal curvature. Results  Corrected visual acuity was (0.99±0.41) after wearing RGPCL for 5 years. Corrected visual acuity was (0.74±0.13) after wearing spectacles for 5 years.  During the 5-year follow up, the average sphere diopter increased significantly less in RGPCL group than in spectacle group(0.623±1.067 D vs. 2.018±1.461 D)(P<0.0001). More strikingly, the cylinder diopter decreased 0.696±0.694 D in RGPCL group, which is significantly different from spectacle group(increased 0.417±0.574 D)(P<0.0001). The average horizontal radius, average vertical radius, average radius of corneal curvature increased (0.046±0.106)mm, (0.189±0.184)mm,  (0.119±0.131)mm after wearing RGPCL for 5 years. Conclusion Myopia and astigmatism progression can be controlled by wearing RGPCL. (Ophthalmol CHN, 2016, 25: 93-97)

Key words: rigid gas permeable contact len, myopia, astigmatism, radius of corneal curvature