SciELO - Scientific Electronic Library Online

vol.61 issue1Macular hole epidemiologyThe effect of the proparacaine hydrochloride 0.5% on the isometric force of the horizontal rectus muscles in strabismus patients author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Arquivos Brasileiros de Oftalmologia

Print version ISSN 0004-2749On-line version ISSN 1678-2925


VAZQUEZ, Mercedes et al. Retreatment in photorefractive surgery with excimer laser. Arq. Bras. Oftalmol. [online]. 1998, vol.61, n.1, pp.82-86. ISSN 1678-2925.


To evaluate the safety and efficacy of repeated excimer laser for treatment of residual myopia and astigmatism.


Eleven eyes (ten patients) with age ranging from 20 to 46 years underwent reablation with excimer laser. Six eyes (54.54%) were treated using photorefractive keratectomy (PRK), two (18.18%) epithelial phototherapeutic keratectomy (PTK-e) followed by PRK, and two (18.18%) with photoastigmatic keratectomy (PARK). Retreatment was done 5 to 16 month after the first treatment (average 9.3 ± 3.4 months) and follow-up ranged from 6 to 23 months (average 9.2 ± 5.4 months). The laser used was the Apex plus Summit excimer laser. Refractive changes, visual acuity and corneal haze were evaluated.


Mean preoperative spherical equivalent was -8.50 ± 3.66D. After the first treatment there was a reduction in the mean spherical equivalent of 55%, -4.04 ± 2.42D, statistically significant (p = 0.0004). After retreatment there was a reduction in the mean spherical equivalent of 28%o compared to the first treatment but this reduction was not statistically significant (p = 0.09). Pre-operative astigmatism was -2.41 ± 1.84. After the first (-2.30 ± 1.70) and second treatment (-2.10 ± 0.80) there was no significant reduction (p = 0.19 e p = 0.30 respectively). After retreatment 36.36% of the eyes presented an uncorrected visual acuity ≥ 20/40 and 63.63% ≥ 20/60. Thirty three percent were within ±1 diopter of emmetropia and 54.54% within 2 diopters. Five eyes (45.54%) lost between one to five lines of the best spectacle-corrected visual acuity after retreatment when compared to preoperative.


Excimer laser retreatment lacks efectivity in cases of high refractive residual ametropies. Decrease in the best corrected visual acuity may be expected as a side effect in these cases.

Keywords : Photorefractive keratectomy; Myopia; Cornea; Surgery; Re-intervention; Complication.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )