IOLMaster versus Manual Keratometry after Photorefractive Keratectomy

• Main Authors: Hasan Razmju, Leila Rezaei, Kobra Nasrollahi, Hamid Fesharaki, Hossein Attarzadeh, Farhad Janbaz Footami
• Format: Article
• Language: English
• Published: Knowledge E 2011-01-01
• Series: Journal of Ophthalmic & Vision Research
• Subjects: Keratometry; IOLMaster; Javal; Clinical History Method
• Online Access: http://www.jovr.org/article.asp?issn=2008-322X;year=2011;volume=6;issue=3;spage=160;epage=165;aulast=Razmju

Purpose: To compare keratometric measurements using a Javal type manual keratometer with IOLMaster in eyes undergoing photorefractive keratectomy (PRK) for myopia. Methods: In this comparative case series, we studied patients aged 21 to 27 years scheduled for myopic PRK. Keratometry was performed preoperatively and three months after the procedure using a Javal type manual keratometer and the IOLMaster. We compared postoperative measurements obtained by both instruments with the clinical history method (CHM). Results: Seventy eyes of 35 patients with mean age of 23.45±1.55 years were studied. Mean preoperative spherical equivalent was -4.53±1.3 D. Average preoperative IOLMaster and manual keratometric readings were 45.95±1.23 D and 46.32±1.18 D, respectively. Postoperatively, mean IOLMaster measurements was 38.03±0.68 D and that of manual keratometry was 43.15±1.1 D. Compared to CHM measurements, the 95% limits of agreement were ‑5.95 to -0.85 for the IOLMaster and -1.44 to 4.04 for manual keratometry. Conclusion: Keratometric measurements with the IOLMaster and a Javal type manual device are comparable after PRK; both are largely deviant from the CHM and can yield misleading results.