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Transepithelial photorefractive keratectomy (TE-PRK) for very low myopic and astigmatic corrections

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Session Details

Session Title: Presented Poster Session: Keratorefractive Results II

Venue: Poster Village: Pod 2

First Author: : N.Davey CANADA

Co Author(s): :    S. Holland   D. Lin   J. Hogden   S. Mosquera     

Abstract Details


Patients can be frustrated by low myopic/astigmatic errors or if left with residual refractions after premium cataract and laser refractive surgery. Surgeons may hesitate to treat very low refractions due to variable predictability. Our aim was to evaluate trans-epithelial Photorefractive Keratectomy for very low myopia and myopic astigmatism using a new high speed excimer laser programme, Schwind Amaris (SA) 1050 SmartSurfACE.


Laser Refractive Clinic


Retrospective case series study. Case inclusion criteria included preoperative spherical equivalent (SE) of ≥-0.50D to ≤ -1.50D with ≤1.50D cylinder. Patients were treated with TE-PRK using SA1050 SmartSurfACE, epithelium thickness was not measured, with standardized phototherapeutic keratectomy (PTK) of 55micron used. Data analyzed included pre- and post-operative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA) and spherical equivalent (SE) with sufficient data for analysis at 12 months.


54 eyes met the inclusion criteria for the study in which 5 eyes had either cataract surgery or laser refractive surgery previously. Refractive improvement was observed with the mean pre-operative SE of -1.18+/-0.32D reduced to mean post-operative SE +0.16+/-0.45D (max -0.75D) in the study population. 98% (53/54) of eyes achieved 20/40 UDVA or better, 94% (51/54) achieved 20/25 or better and 85% (46/54) achieved 20/20 or better at 12 months follow-up. Only one patient lost one line of CDVA and none lost two or more lines. However 24% (13/54) gained one line of CDVA.


Patients with high expectations and low myopic and myopic astigmatic refractive error may be effectively treated with TE-PRK using Schwind Amaris 1050 excimer laser. The technique may also be safe and effective for correction of small degrees of residual refractive errors after cataract or laser refractive surgery.

Financial Disclosure:

is employed by a for-profit company with an interest in the subject of the presentation, travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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