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[The evaluation of visual quality in keratoconus eyes corrected by rigid gas-permeable contact lens]
Pei-ying Xie1, Dan Wang, Li-na Yang
1Peking University Optometry & Ophthalmology Center, Beijing 100083, China. xpy@b-d.ac.cn
Objective:
To evaluate the visual quality in keratoconus eyes corrected by rigid gas-permeable contact lens (RGPCL) and spectacles.
Methods:
Corrected visual acuity, corneal topography, wavefront aberration and contrast sensitivity were measured in 27 keratoconus patients (54 eyes) before and after the fitting of RGPCL.
Results:
The inclusive keratoconus eyes were divided mild 30 eyes, moderate 13 eyes and sever 11 eyes. The average myopia and average astigmatism were (6.92 +/- 3.66) D and (5.75 +/- 1.85) D respectively. Uncorrected visual acuity (VA) in 96.3% keratoconus eyes was
Conclusions:
Corneal distortion induced high corneal irregular astigmatism is the most frequent cause of increase of aberration and reduced ocular optical quality in keratoconus. Proper RGPCL fitting provides an effective method in reshaping of ocular surface combined with tear film. RGPCL could reduce aberrations and corneal astigmatism, improve optical quality, and finally, increase visual acuity and contrast sensitivity.
