compared with a concurrent series of triple procedures , the advantage of providing patients with refractive errors closer to emmetropia by performing surgery after a corneal transplant is outweighed by the increased risks to the graft , the increased costs and medical risks of two operations , the risk of increased astigmatism , and the delay in visual acuity recovery from the time of keratoplasty until obtaining a final refraction after secondary surgery .
C0034951
refractive errors
C0004106
astigmatism