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A 28 year-old female patient with history of recurrent keratitis from wearing disposable contact lenses on a daily basis has come to seek for medical attention. The patient was then diagnosed with keratoconus with corneal topography. The steepest curve is 49D on the right eye while 48.3D on the left respectively (Figure 1 and 2). A brief profile of the patient is provided below:
|
|
Right (OD) |
Left (OS) |
|
Curvature (steep K) |
49D |
48.3D |
|
Myopia |
-7.00D |
-7.50D |
|
Astigmatism |
-1.00D |
-1.50D |
Fortunately, the bulging area of the right eye (Figure 3 and 4) is located 2 mm away from the center of the cornea while the bulging area of the left eye is located 1.5 mm outside the center of the cornea which makes more astigmatism on the left eye because the closer the cone is to the center of the cornea, the higher the astigmatism a patient will experience.
With fitting of limbal RGP lenses (Figure 5 and 6), the patient’s best corrected visual acuity is 1.0 on the right eye and 0.9 on the left eye respectively. According to the patient, the comfort scale of wearing the limbal RGP lenses is about 90 (out of 100), similar to wearing daily disposable contact lenses.
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.