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Published on: April 3, 2016
Axial eye length evaluation before and after myopic photorefractive keratectomy
Nicola Rosa1, Luigi Capasso, Michele Lanza
1Department of Ophthalmology, 2nd University of Naples, Naples, Italy. nicola.rosa@unina2.it
Purpose:
To test the accuracy of a new device (IOL Master; Carl Zeiss, Jena, Germany) in detecting axial eye length changes after photorefractive keratectomy (PRK).
Methods:
Pre- and postoperative (1, 3, and 6 months) subjective refraction and axial eye length measurements were performed in 184 consecutive eyes that underwent PRK with the Nidek EC5000 excimer laser (Nidek Technologies, Gamagori, Japan) to treat refractive errors from +0.25 to -16.25 diopters (D) (mean: -5.12 +/- 3.01 D).
Results:
The axial eye length measurements ranged from 22.51 to 31.32 mm (mean: 25.61 +/- 1.47 mm) before PRK; from 22.39 to 31.10 mm (mean: 25.48 +/- 1.43 mm) 1 month after PRK; from 23.17 to 31.14 mm (mean: 25.61 +/- 1.36 mm) 3 months after PRK; and from 23.36 to 29.68 mm (mean: 25.58 +/- 1.35 mm) 6 months after PRK. Preoperative and 1-month postoperative data showed a statistically significant difference (P<.001), whereas no significant difference was found between 1 and 3 months (P=.0137) or 3 and 6 months (P=.2422).
Conclusions:
The IOL Master showed a decrease in the axial eye length measurement larger than the theoretical ablation depth and the difference increased as the correction became higher.
