Agreement of Actual Corneal Power and Corneal Power Using Topography in Cataract Patients Undergone Refractive Surgery

ABSTRACT

PURPOSE: To evaluate the agreement between actual corneal power and corneal power using Orbscan II of cataract patients who have undergone refractive surgery. METHODS: We retrospectively evaluated 18 eyes of 14 patients who underwent cataract surgery after refractive surgery. IOL power was targeted for emmetropia retrospectively using the manifest refraction two months after cataract surgery with SRK ll or SRK-T. We evaluated the agreement between actual corneal power and corneal power using 1 mm, 2 mm, 3 mm and 4 mm zone of Orbscan II TOP maps. RESULTS: The actual corneal power of cataract patients who underwent refractive surgery and 1 mm, 2 mm, 3 mm and 4 mm zone of Orbscan II TOP maps shows high agreement. When using a corneal power of 1 mm, 2 mm, 3 mm and 4 mm zone of Orbscan II TOP map, the following estimated refractive powers were observed at a 1 mm zone 0.21+/-0.69D, 2 mm zone 0.14+/-0.70D, 3 mm zone 0.25+/-0.95D and 4 mm zone 0.65+/-0.92D. CONCLUSIONS: The actual corneal power of cataract patients who have undergone refractive surgery and 1 mm, 2 mm, 3 mm and 4 mm zone of Orbscan II TOP maps show high agreement. We recommend selecting a corneal power corresponding to 1 mm or 2 mm zone of Orbscan II TOP maps to avoid hyperopia after cataract surgery.