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The effect of preoperative and treatment parameters on the postoperative functional optical zone after refractive surgery

Poster Details

First Author: E.Eskina RUSSIA

Co Author(s):    S. Arba-Mosquera   T. Magnago   V. Parshina        

Abstract Details

Purpose:

To evaluate the functional optical zone (FOZ) and influencing parameters among eyes that underwent surface treatments for myopic astigmatism with PRK or TransPRK.

Setting:

Prof. Erika N. Eskina, MD, Ophthalmological Department of National medical-surgical center Institute of postgraduate medical education Ministry of Health RF Laser surgery clinic SPHERE, Moscow, Russia

Methods:

16 patients (32 eyes) treated with TransPRK (26±5 years, range 21 to 36) with SEQ -5.65D±1,07D (range -4,25D to -7,5D) and 16 patients (32 eyes) treated with PRK (26±7 years, range 22 to 41) with SEQ -5.78D±1,18D (range -4,25D to -7,5D) using the SCHWIND AMARIS flying-spot excimer laser system (SCHWIND eye-tech-solutions) were analysed at six-month. Mitomycin C has been used in in all cases. Clinical outcomes were evaluated in terms of functional optical zone (FOZ), effective optical zone (EOZ), planned optical zone (POZ), influence from refraction and k-readings.

Results:

Between the TransPRK and PRK groups there were no statistical significant difference noticeable. Each extra 1mm for the POZ will increase the EOZ by 0,94mm which means that for a 1 mm larger FOZ a planning of an additional OZ of 1.07mm is needed. Each mm extra FOZ in the pre-op planning will result in 0,24mm extra larger EOZ. Each diopter extra SEQ reduces the effective OZ by 0,40mm or each 2,5D extra SEQ the EOZ is reduced by 1mm. No statistical significant correlation had been found for visual acuity, k-readings, topographical astigmatism, depth of ablation, pre-op corneal pachymetry.

Conclusions:

Differences between the post-op FOZ and the POZ are significantly depending on the amount of refractive correction. We found the dependency of EOZ = 0,94xPOZ + 0,23xFOZpre + 0,40xSE + 0,31xCyl (SE is with negative sign if myope and cyl is always used with absolute value).

Financial Disclosure:

One or more of the authors is employed by a for-profit company with an interest in the subject of the presentation

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