Abstract
OBJETIVO: Estabelecer modelos de regressão linear entre os índices propostos por Alpins com os vetores astigmáticos de Thibos, avaliando a validade e a força dessas correlações. MÉTODOS: Série de casos na qual foram avaliados prospectivamente 62 olhos de 31 pacientes de catarata com astigmatismo corneano pré-operatório entre 0,75 e 2,50 dioptrias para ambos os olhos. Os pacientes foram aleatoriamente distribuídos entre 2 grupos: um submetido a implante de lente intraocular (LIO) AcrySof ToricTM em ambos os olhos e outro grupo, [...]
Highlights
METHODSVectors are mathematical expressions that combine values for magnitude and direction
Three fundamental vectors are used in the analysis: target-induced astigmatism (TIA) - the astigmatic change the surgery was intended to induce, surgically induced astigmatism (SIA) - the astigmatic change the surgery induced and difference vector (DV) - the induced astigmatic change that would enable the initial surgery to achieve its intended target
The Alpins method has been used by several authors to analyze the astigmatic changes induced with different surgical and nonsurgical options[1], including limbal relaxing incisions[1,3,4,5], excimer laser refractive surgery, toric intraocular lens implantation, vitrectomy or orthokeratology[6]
Summary
METHODSVectors are mathematical expressions that combine values for magnitude and direction. Astigmatism, with cylinder power and axis (refractive) or magnitude and meridian (corneal), fits such a description[1,2]. The Alpins method is a vectorial analysis that allows determination of the effectiveness of a specific astigmatic treatment.
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