Changes in keratometric corneal power and refractive error after laser thermal keratoplasty

Abstract

After LTK, corneal power measured by manual keratometry was smaller than that measured by corneal topography and changes in corneal power measured by conventional keratometric instruments were greater than changes in refractive error. This difference should be considered in calculating IOL power in post-LTK eyes to prevent undesirable hyperopia after cataract surgery.

Intraocular lens power calculation after combination laser in situ keratomileusis and noncontact holmium:YAG laser thermal keratoplasty using Orbscan videokeratography

“…This difference should be considered in calculating IOL power in post-LTK eyes to prevent undesirable hyperopia after cataract surgery. 3,4 Qazi et al 5 recently demonstrated that the Orbscan II 5.00 mm total axial power and 4.00 mm total optical power can be used to more accurately predict true corneal power after myopic refractive surgery. Só nego-Krone et al 6 determined that direct measurement of central corneal optical power using Orbscan maps provides accurate post-refractive surgery corneal power, independent of historical refractive data in post-refractive surgery eyes.…”