Calculating intraocular lens power in eyes with keratoconus using videokeratography.
A patient with keratoconus had cataract extraction and intraocular lens (IOL) implantation in both eyes. The IOL power was determined using keratometric values (K-values) measured by standard keratometry in the right eye and videokeratography in the left eye. The ideal IOL power and the K-value that would have led to the ideal IOL power were determined from the postoperative refraction at 6 weeks. The ideal K-value was compared with the K-values derived from videokeratography and standard keratometry. Refraction at 6 weeks postoperatively was 5.60 and 1.00 diopter more myopic than the aim in the right and left eye, respectively. The mean power in ring 3 in videokeratography of the left eye was the same as the ideal K-value calculated using the Holladay formula. Determining IOL powers with videokeratography-derived K-values might be more accurate than standard keratometry in patients with keratoconus.
Celikkol
L
L
Department of Ophthalmology, University of California, San Diego School of Medicine, La Jolla 92093-0684, USA.
Ahn
D
D
Celikkol
G
G
Feldman
S T
ST
D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007640:Keratoconus / Q000150:complications*; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D018918:Phacoemulsification; D012029:Refraction, Ocular; D014792:Visual Acuity