Vector analysis with the femtosecond laser

Influence of Preoperative Astigmatism Type and Magnitude on the Effectiveness of SMILE Correction

“…Kobashi et al 27 also reported astigmatism undercorrection (-0.33 ± 0.45 D) in a patient sample whose astigmatism ranged from -1.00 to -2.75 D. These outcomes were similar to those recently reported by Khalifa et al 28 (mean magnitude error -0.20 ± 0.35 D), although the latter included astigmatism levels up to -3.25 D. Despite using non-conventional terminology, 29 Kunert et al, 30 found a slight astigmatic undercorrection (approximately 10%) in a sample of 113 patients with myopic astigmatism (cylinder range: -6.00 to -0.25 D).…”

“…In any case, according to what other authors have reported, an undercorrection is an advantage because it is much easier to correct a postoperative myopic undercorrection than a hyperopic shift. 29 From a clinical point of view, undercorrection would be better than overcorrection because a change in the direction of the cylinder axis would probably be poorly accepted by patients. 33 As we can see, most authors' conclusions are well aligned regarding astigmatism undercorrection in SMILE procedures.…”

JRS Standard for Reporting Astigmatism Outcomes of Refractive Surgery

“…Although this was highlighted at the time in correspondence to the Editor, 19 the altered terminology has been used subsequently in many publications reporting astigmatism. 20 Our position at the Journal is that all future reports of astigmatism should adhere to the original terminology as described by Alpins. 9,17,18 There are three reasons for this, and the guiding principle is clarity in communication above all else.…”