Quality of Viion and Graft Thickne in Deep Anterior Lamellar and Penetrating Corneal Allograft Original Reearch Article

Purpoe To compare viual function after deep anterior lamellar keratoplaty (DALK) with viual function after penetrating keratoplaty (PK) for keratoconu and correlate thi with corneal thickne. Deign Retropective cae erie. Method Twenty-three patient (32 eye) with unilateral or bilateral DALK or PK for keratoconu were analyzed for viual quality after uture removal. Evaluation included meaurement of viual acuity, contrat enitivity, and higher order aberration (HOA) (Wavecan®; Vix, anta Clara, California, UA). Reading were performed with both pectacle and rigid contact len correction of refractive error. Total and reidual tromal thickne after DALK wa meaured uing optical coherence tomography (OCT) and correlated to viual quality. Reult Eye after PK had better viual acuity than eye after DALK (P = .018). ubgroup analyi of DALK eye revealed that the level of viual acuity wa related to the thickne of reidual recipient corneal troma. Eye with a recipient corneal bed thickne of <20 μm had viual acuitie imilar to eye with a PK, wherea thoe with a recipient thickne of >80 μm had a ignificantly reduced viual acuity (P = .0009). Contrat enitivity wa imilar in DALK and PK eye. There wa no ignificant difference in HOA between eye with DALK or PK. Concluion Thee data ugget that the main parameter for good viual function after DALK for keratoconu i the thickne of reidual recipient tromal bed. An eye with a DALK with a reidual bed of <20 μm can achieve a imilar viual reult a a PK.