INTRAOCULAR LENS POWER CALCULATION AFTER RADIAL KERATOTOMY | ||||
| ALEXMED ePosters | ||||
| Article 1, Volume 5, Issue 2, April 2023, Page 23-24 | ||||
| Document Type: Preliminary preprint short reports of original research | ||||
| DOI: 10.21608/alexpo.2023.216308.1622 | ||||
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| Authors | ||||
Alaa Atef Ghaith1; Hany Helaly2; Soha Ahmed Maddi  3
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| 1Department of ophthalmology, faculty of medicine, Alexandria university, Alexandria ,Egypt | ||||
| 2Department of ophthalmology, faculty of medicine, Alexandria university | ||||
| 3Department of Ophthalmology, Faculty of Medicine, Alexandria University | ||||
| Abstract | ||||
| Surgeons have long been aware of the difficulties that radial keratotomy (RK) poses for IOL calculations when patients later present for cataract surgery. Challenges are in peri-operative planning, surgical execution and refractive expectations. Firstly, RK alter the basic assumptions on which the biometry for IOL calculations is based – namely the perfectly spherical nature of cornea affecting the normal corneal curvature and anterior: posterior relationship. Secondly, the optical zone is often less than 3.0mm, so standard keratometry measures the region representing the inflection point between the incised cornea and the indirectly flattened central zone leading to overestimation of corneal power and a risk of hyperopic refractive error when standard formulae are used. Furthermore, post-RK corneas are frequently irregular with multiple steep and flat areas, making determination of the net steep and flat meridians challenging. AIM OF THE WORK: This study aims at comparing different intraocular lens (IOL) power calculation formulas in patients who have undergone cataract surgery after radial keratotomy (RK). | ||||
| Keywords | ||||
| RADIAL KERATOTOMY (RK); INTRAOCULAR LENS POWER CALCULATION (IOL); cataract | ||||
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