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       XXIII Annual Congress of the Iranian Society of Ophthalmology        بـیــست و سومین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: IOL Power Calculation and Post-Op Refraction in a Post-RK Patient With Help of Pentacam : A Case Report
Author(s): Ghandehari-Motlagh Mohammad
Presentation Type: Poster
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Mohammad Ghandehari Motlagh
Affiliation :(optional) Optometrist (Sadra Eye Surgery Center), Isfahan- Iran
E mail: oculist233@aol.com
Phone: 03116689608
Mobile: 09132000891
Purpose:

P=n-1/R:as a Famous formula is an explanation for common surprises in IOL power calculations of post-RK cases due to keratometery errors .Due to the smaller optical zone of a post-RK cornea than post-PRK one,and on the other, keratometers can measure only 3-4 mm paracentral anterior portion of the cornea(not central),then IOL master consider the steeper paracentral K-readings for the flat central cornea. In post-RK corneas 3-4mm paracentral is steeper than central and so underestimated IOL power and a post-op hyperopia will be expected. Then we have to use imaging devices especially Pentacam for small optical zones(even 2mm) for an accurate k-reading.

Methods:

Ocular biometry(IOL master 500)was done for a 30 yrs/old post-RK cataractous patient and so I couldn’t rely on k-redings of IOL master. So imaging with Pentacam was done and Power Distribution Display/ 2mm Total Refractive Power, were my k-readings entered in IOL master. Axial lengths:OD=26.56 and OS=26.81 and so the selected formulas were Haigis and SRK/T.Selected target refraction= -0.25.Average K-readings with IOL master were 37.3 and 36.But in 2mm optical zone with pentacam was 36.45 and 35.10.

Results:

Post-op residual refractive error = -0.25 D.

Conclusion:

Pentacam is a valuable instrument for IOL power calculations in post-RKs with small optical zone of RK.

Attachment:





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  - بـیــست و سومین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران