ISSN: 1300-0365
Dil: Türkçe
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Intraocular Lens Power Calculation Problems In Patient With Prior Keratorefractive Surgery And Optic Coherence Biometry
Selim DOĞANAY*, Mehmet BORAZAN**
* Yrd.Doç.Dr., İnönü Üniversitesi Tıp Fakültesi Göz Hastalıkları AD, ** Arş.Gör.Dr., İnönü Üniversitesi Tıp Fakültesi Göz Hastalıkları AD, MALATYA
The number of patients who have had keratorefractive surgery radial keratotomy (RK), photorefractive keratectomy (PRK), laser in-situ keratomileusis (LASİK) has been steadily increasing over the past 20 years. Intraocular lens power calculation is a major problem after keratorefractive procedures and triple procedures, because we can not determine the correct central keratometric values after keratorefractive surgery with traditional keratometers due to the oblate aspherical shape caused by the refractive surgery. To determine the correct intraocular lens power after keratorefractive surgery we have to use some methods including clinical history, contact lens overrefraction etc. However precise measurement of the eye parameters is critical in modern ophthalmology. We can take inaccurate axial length measurement with A-scan ultrasound biometry. These errors are going to cause unplanned postoperative refractive error. A solution to the limitations of A-scan ultrasound biometry is a new measurement technique called optic coherence biometry. It is a comfortable and safe procedure for cataract patients. However it is the first non-contact single instrument system providing cataract and refractive surgeons with swift and accurate measurements of axial lenght, corneal curvature and anterior chamber depth.Keywords: Intraocular lens power calculation, Cataract surgery, PRK, LASIK, RK, Penetrating keratoplasty, Triple procedure, Optic coherence biometryTurkiye Klinikleri J Ophthalmol 2004, 13:94-103
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