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Post-PRK corneal ectasia linked to early keratoconus
J Refract Surg. 2008;24(8)843-847.
A case report supports evidence that patients with preoperative forme fruste keratoconus or early keratoconus may develop clinically significant corneal ectasia after PRK.
Researchers summarized a case report of a 25-year-old man who underwent uneventful PRK. The patient had moderate myopia: –5.75 – 1.75 × 95 in the right eye and –7.50 – 1.25 × 80 in the left eye. The patient’s best corrected visual acuity was 20/25 in both eyes.
Preoperative corneal thickness was 500 µm in the right eye and 460 µm in the left eye. Total calculated ablation depth was 70 µm in the right eye and 100 µm in the left eye. Preoperative corneal topography showed forme fruste keratoconus in the right eye with an inferior-superior ratio of 4.
At 5 years after surgery, the patient had developed unilateral inferior keraectasia in the right eye with refraction of +0.50 – 5.50 × 90, BCVA of 20/100, central corneal thickness of 481 µm and inferior corneal thickness of 374 µm.