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A 25 year-old male patient who suffering from blurry vision has come to seek for medical advice. With a subjective refraction of -4.50 -1.75 x 180 OD and -4.25 -1.00 x 180 OS, the best-corrected visual acuity (BCVA) were 1.0 for both eyes. The patient still found his vision being blurry although the spectacle had been used to correct the vision. He was then diagnosed with keratoconus where the cones were located at the upper part of both corneas. The corneal topography was shown in Figure 1 and 2. As a result, the blurry vision experienced by the patient was due to irregular astigmatism even though his BCVA were 1.0 for both eyes. With limbal RGP lenses, the patient could have a good vision of 1.5 for both eyes respectively (Figure 3 and 4).
Figure 1. Corneal topography of right eye. The red and purple area shows the cone on the cornea.
Figure 2. Corneal topography of left eye. The red and purple area shows the cone on the cornea.
Figure 3. Limbal RGP lens fitting on right eye.
Figure 4. Limbal RGP lens fitting on left eye.