Abstract
Purpose: :
To evaluate the optical quality of the eye after insertion of an Artisan phakic intraocular lens for the treatment of high myopia.
Methods: :
14 eyes of 7 patients implanted with the Artisan® lens between 1999 and 2002 for the correction of high myopia were included. The ocular wavefront aberration and the centration of the optic of the Artisan lens with regards to the pupil center were analysed using a scanning slit refractometer (OPD–Scan®, Nidek, Japan) in October 2005. The decentration of the Artisan lens was defined as the distance from the center of the lens optic to the center of the mesopic pupil ring. Contrast sensitivity was also measured with the Optec ® 6500 vision tester.
Results: :
The mean spherical equivalent was –1.05 +/– 0.9 D (range: 0 to –2.4 D), with a mean uncorrected and best–corrected visual acuity of 20/32 (range: 20/125 to 20/16), and 20/20 (range: 20/25 to 20/16) respectively. Total ocular higher–Order Aberrations (HOAs) were 0.7 +/– 0.33 µm for a 5 mm zone. The diameter of the scotopic pupil remained inferior to 6.0 mm in all patients (maximal pupil diameter of 5.67 mm), even after pharmacological dilation. The mean decentration of the optic was 0.47 ± 0.25 mm. There was no correlation between the postoperative BCVA and the magnitude of the decentration (r2 = 0.17). Conversely, Total Spherical Aberrations (r2 = 0.64) and Total ocular High Order Aberrations (r2 = 0.40) tend to be correlated with decentration. There was no correlation between the contrast sensitivity function and decentration.
Conclusions: :
Patients implanted with Artisan lens after 3 to 6 years for the correction of high myopia have good visual results despite pupil relative decentration and moderately increased HOAs. We found a reduction of the pupil dilation amplitude which cause(s) must be elucidated.
Keywords: refractive surgery: optical quality • refractive surgery: phakic IOL • myopia