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Surgical correction of hyperopia: a new experimental approach using X-incision and suture technique in rabbits.

BACKGROUND
A new experimental surgical technique to correct hyperopia by steepening the central corneal curvature was performed on the eyes of rabbits.


METHODS
After X-shaped incisions at four quadrants of the paracentral cornea, four deep, transverse interrupted sutures were placed across the incisions and the knots were tightened to compress the corneal tissue in the direction of the suture. Twenty-three eyes of 12 albino rabbits were divided into group A (7 eyes) with a 4-millimeter diameter clear zone, group B (9 eyes) with a 6-millimeter diameter clear zone, and control group C, consisting of 7 contralateral eyes of group A without any incision or suture.


RESULTS
There was significant (p < .01) steepening of the central cornea as measured by the keratometer at postoperative 8 weeks in group A (+1.88 diopters) and group B (+1.68 D) compared with that of the control group C (-3.44 D). The difference in effect of hyperopic correction between groups of A and B was not statistically significant.


CONCLUSIONS
This procedure serves only as an experimental model of corneal response to incisions and sutures and is not for use in human corneas.