[Residual myopia after penetrating keratoplasty for keratoconus].
OBJECTIVE
To study the results of penetrating keratoplasty for keratoconus analyzing the differences in ultimate spherical equivalent according to graft size and the trephine used in the recipient.


METHODS
Retrospective study of 38 patients that were divided into three groups. Group A is composed of patients with a 0.50 mm donor-recipient difference, 0.25 mm in group B and same-sized in group C. In each group visual acuity, spheric equivalent, keratometry and other parameters were assessed. Statistical analysis was performed by comparing the means of the parameters evaluated.


RESULTS
We found a better final visual acuity in group C when compared with group A, and a lower spherical equivalent when we compared groups A with C and A with B. The results were better in those groups where the donor-recipient difference was smaller.


CONCLUSIONS
We believe that it is convenient to minimize the size difference between donor and recipient or to use same-sized trephines to diminish the final spheric equivalent.
Domingo Gordo
B
B
Hospital General Universitario Gregorio Marañón, Departamento de Oftalmología, Madrid, Spain. domingoblanca@hotmail.com
Conejero Arroyo
J
J
Balado Vázquez
P
P
D005260:Female; D006801:Humans; D007640:Keratoconus / Q000601:surgery*; D015948:Keratoplasty, Penetrating / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000209:etiology*; D011183:Postoperative Complications; D012029:Refraction, Ocular; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity