Wavefront Analysis in Asian-Brazilians

Abstract

PURPOSE: To compare the distribution of ocular higher order wavefront aberrations (third to sixth order) in the Brazilian population of Asian and non-Asian refractive surgery patients. METHODS: Preoperative refractive and wavefront data were reviewed for 648 eyes in 324 patients who underwent custom ablation at the Excimer Laser Santa Cruz refractive surgery center in São Paulo, Brazil, from March 2002 to July 2005. Patients were divided into two groups: Asian patients and non-Asian patients, based on family history. Statistical analysis was performed to assess the differences between the groups with respect to manifest refractive spherical equivalent, astigmatism, pachymetry, OPD-root-square-mean (RMS) for a 6.0-mm pupil, total wavefront aberrations, third- to sixth-order higher order aberrations, and individual aberrations. RESULTS: The mean spherical equivalent refraction in the Asian group of -4.38 diopters (D) was significantly higher than the spherical equivalent refraction of -3.46 D in the non-Asian group (t=-4.32; P=.00001). Comparison of the differences between groups with respect to higher order aberrations, coma, trefoil, quadrafoil, spherical aberration, higher order astigmatism, and pachymetry was not statistically significant. CONCLUSIONS: Asian patients have a higher prevalence of myopia than non-Asian patients. No differences were noted in higher order aberrations between Asian and non-Asian patients. [J Refract Surg. 2006;22:S1024-S1026.]

Spherical aberration after implantation of an aspheric versus a spherical intraocular lens in high myopia

“…The magnitude of corneal spherical aberration found in this study was similar to that previously reported in a group of senile cataract patients 13 . It is reported that spherical aberration is not associated with high degrees of myopia, 14 and no difference in spherical aberration is noted between Asian and non‐Asian patients 15 . Before surgery, the mean corneal spherical aberrations in aspheric and spherical groups were 0.30 ± 0.11 and 0.29 ± 0.13 µm, respectively, for 6‐mm pupil diameter.…”

“…13 It is reported that spherical aberration is not associated with high degrees of myopia, 14 and no difference in spherical aberration is noted between Asian and non-Asian patients. 15 Before surgery, the mean corneal spherical aberrations in aspheric and spherical groups were 0.30 Ϯ 0.11 and 0.29 Ϯ 0.13 mm, respectively, for 6-mm pupil diameter. This is similar to the investigation that the mean corneal spherical aberration was 0.32 Ϯ 0.12 mm at a 6-mm pupil size in 70 eyes of 70 cataract patients aged from 32 to 89 years.…”

Comparison of ocular monochromatic Higher-order aberrations in normal refractive surgery candidates of Arab and South Asian Origin

“…Measurement of the HOA profile can be affected by multiple factors including pupil size, cycloplegia, age, ethnicity, ocular surface status, and the device used. 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 …”

“…The HOA profiles of Caucasian, Asian Chinese, Asian Indian, and Brazilian eyes have been documented in the literature. 22 23 24 25 26 27 28 However, other than a study measuring corneal spherical aberration, there are no studies in the literature to evaluate the total ocular wavefront profile in Arab eyes. 29 In this study, we evaluate the ocular (whole eye) wavefront profile of refractive surgery candidates of Arab origin and compare it to candidates of South Asian (Indian sub-continent) origin.…”

Avaliação multidimensional da dor no pós-operatório da ceratectomia fotorrefrativa e fatores preditivos de dor

“…(7,8) As complicações do LASIK se concentram na confecção da lamela, o que não ocorre com a PRK, e no risco de enfraquecimento biomecânico da córnea resultando em uma possível indução de ectasia corneana iatrogênica. (9,10) A técnica PRK também não é isenta de complicações, a exemplo da formação de opacidade corneana no pós-operatório, geralmente secundária a correção de altos graus de miopia. (11,12) A imposição de limites na profundidade de fotoablação dos olhos submetidos a PRK e as modernas plataformas de excimer laser contribuíram para uma sensível diminuição da incidência de opacidades corneanas.…”