Aphakic Refraction Method for IOL Power Calculation in Patients With Previous Laser Refractive Surgery

Friday, April 25, 2014
KIOSKS (Boston Convention and Exhibition Center)
Nathali Alvarez, MD, IDEO, Instituto Docente de Especialidades Oftalmologicas, Maracaibo, Zulia, Venezuela
Mary C. Oliveros, MD, Instituto Docente de Especialidades Oftalmologicas, IDEO, Maracaibo, Venezuela
Aletzaida M. Chirguita, MD, Instituto Docente de Especialidades Oftalmologicas, IDEO, Maracaibo, Venezuela
Marco Rios, MD, IDEO, Maracaibo, Zulia, Venezuela

Narrative Responses:

Purpose
To evaluate the visual and refractive results of aphakic refraction method for IOL power calculation in patients with previous laser refractive surgery.

Methods
Prospective, longitudinal study in 35 eyes of 20 patients with a history of refractive surgery (assisted in situ keratomileusis laser, LASIK) without data information, and cataracts underwent conventional phacoemulsification surgery with IOL implantation calculated by aphakic refraction method between January 2009 and July 2013. Manifest refraction, distance and near visual acuity uncorrected (UCVA) and corrected (BCVA) was evaluated preoperatively and three months after surgery. Data were expressed as arithmetic mean, standard deviation (SD), absolute numbers and percentages, statistical significance P = 0.05.

Results
The spherical equivalent (EE) obtained three months postoperatively was -1.19 diopters (D), ± 0.99 standard deviation (SD). 57.14% of patients with EE ± 1.00 D, 28.57% EE ± 0.50D. Distance UCVA LogMAR 0.12 ± 0.09 SD, 88.57% obtained a distant BCVA ≤ 20/30. 98% achieved an improvement of near vision.

Conclusion
The aphakic refraction method for calculating IOL power previous laser refractive surgery is an alternative in patients with a history of refractive surgery without access to medical records prior to the intervention.