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Comparison of visual outcomes

Poster Details

First Author: N.Nassiri IRAN

Co Author(s):    F. Mahmoudi Khosravi   N. Nasiri   K. Sheibani   S. Nassiri     

Abstract Details

Purpose:

To compare contrast sensitivity and visual outcome after photorefractive keratectomy (PRK) for correction of moderate myopia with or without astigmatism with two methods of excimer laser: tissue saving and wavefront optimized.

Setting:

Vanak Eye Surgery Center, Tehran, Iran.

Methods:

This comparative case series prospective study comprised 152 eyes of 80 patients with moderate myopia, with and without astigmatism, and a mean spherical equivalent (SE) of -4.5±1.02 who randomly underwent PRK either using tissue saving (Technolas 217 z) or wavefront optimized (Allegretto Wave Eye Q) methods. Preoperative and 3 months postoperative photopic and mesopic contrast sensitivity were compared between two groups.

Results:

76 eyes of 39 patients were treated with tissue saving and 76 eyes of 41 patients using wavefront optimized method. No statistically significant differences were seen in best spectacle corrected visual acuity, uncorrected visual acuity and spherical equivalent between two groups 3 months postoperatively. Also no statistically significant differences were seen in amount of preoperative to postoperative contrast sensitivity changes between two groups in photopic and mesopic conditions. Higher order aberrations and Q factor significantly increased in both groups postoperatively (P=0.001) with tissue saving method causing more increases in higher order aberrations (P=0.007) and Q factor (P=0.039) .

Conclusions:

Both platforms are effective in correcting moderate myopia with or without astigmatism with tissue saving method causing more increases in higher order aberrations and Q than wavefrontoptimized group but no difference in contrast sensitivity changes and patient satisfaction.

Financial Disclosure:

NONE

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