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Method for refractive correction of myopic regression following radial keratotomy

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First Author: T.Shilova RUSSIA

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Abstract Details

Purpose:

To use of the method of refractive correction ReLEX SMILE for patients after radial keratotomy with myopia regression. To evaluate effectiveness and stability of results - three years of observation.

Setting:

SMILE EYES Moscow, Russia

Methods:

Study included 24 eyes after RK with SEQ -1.5 – 4.25 D, patients age was 45 years. Microcut of 1.5 mm is made between the keratotomy incisions. Lenticule is formed with diameter of optical zone in accordance with pupil diameter defined in mesopic conditions. Energy of femtosecond pulse of 125-130 nJ is used. Distance between the pulses is equal to the diameter of the laser spot making 4.3 mcm for the front surface of the lenticular, 4.4-4.5 mcm for the back surface of the lenticule, and 1.7 mcm for the edge of the lenticular, the separation strictly in the plane.

Results:

With these parameters, high-quality profiles of the lenticular surfaces are formed, while there is no OBL formation and "gas breakthrough" in the scar tissue. In all cases, there was a complete qualitative separation of the lenticule in one block, there was no deep divergence of scar tissue. The stability of the outer wall of the cornea – the epithelium, Bowman's membrane, and the upper layer of the stroma was preserved. Postop refraction, Pentacam, CORVIS and UCVA was stable for 3 years of observation. Subjectively, high patient satisfaction was observed. Halos were observed only in the first week after surgery.

Conclusions:

Method provides fast restoration of high visual acuity in the distance with preservation of mechanical strength of cornea frame and its biomechanics, elimination of risk of rupture of flap along old scars, displacement of flap petals, irregular astigmatism associated with longitudinal transverse incision of corneal tissue.

Financial Disclosure: