Predicted versus actual intraocular lens power in silicon-oil-filled eyes undergoing cataract extraction using automated intraoperative retinoscopy.
OBJECTIVE
To compare predicted intraocular lens (IOL) power obtained with adjusted ultrasound biometry versus actual power obtained with automated intraoperative retinoscopy (AIR) in eyes undergoing combined cataract extraction and silicon oil removal in the same session.


METHODS
Fifty eyes with significant cataract; requiring silicon removal were included. Preoperative ultrasonic biometry with adjusted velocity (980 m/s) was recorded. After silicon removal, AIR was done and IOL power was calculated and inserted. Postoperative refraction was recorded up to 3 months.


RESULTS
AIR was successfully obtained in all eyes. Significant correlation (p = 0.000, R = 0.91) was detected between mean power of predicted (15.8 ± 8.4) and implanted IOL (11.7 ± 8.5). Mean postoperative refraction was +0.53 ± 0.31 at 1 week, +0.40 ± 0.35 at 1 month and +0.12 ± 0.20 at 3 months. The difference was statistically significant in all time intervals. Myopic shift occurred in 37% of eyes at the third month.


CONCLUSIONS
AIR in combined cataract extraction and silicon oil removal is easy and provides predictable outcome in all eyes. It represents a bypass to all methods of biometry based on axial length measurement. Future correction formula based on adjusted ultrasound velocity can be a simple alternative and predictable method.
Mansoura Ophthalmic Center, Mansoura University, Mansoura, Egypt. amalelbendary67@gmail.com
Amal M
AM
Elbendary
Mohamed M
MM
Elwan
D000328:Adult; D001699:Biometry / Q000379:methods; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D018918:Phacoemulsification; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D012164:Retinal Diseases / Q000601:surgery; D042262:Retinoscopy / Q000379:methods*; D012827:Silicone Oils; D013396:Suction; D014792:Visual Acuity / Q000502:physiology; D014821:Vitrectomy; D055815:Young Adult
D012827:Silicone Oils