Kelvin H Wan1, Rachel W Y Tsui2, Tommy C Y Chan3,4. 1. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong. 2. Hong Kong Eye Hospital, Kowloon, Hong Kong. 3. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong. tommychan.me@gmail.com. 4. Department of Ophthalmology, Hong Kong Sanatorium and Hospital, Happy Valley, Hong Kong. tommychan.me@gmail.com.
Abstract
PURPOSE: To investigate the postoperative straylight changes during the visual recovery phase after small incision lenticule extraction (SMILE) and their association. METHODS: Seventy consecutive eyes from 37 patients with a mean age of 30.92 ± 7.26 years and a mean preoperative spherical equivalent of -5.24 ± 1.90 dioptres undergoing myopic or myopic astigmatism SMILE correction were included in this prospective study. Patients were followed up at days 1, 3, 7, 14, 21 and 28 after standard SMILE. Straylight was measured using the C-Quant straylight meter (Oculus GmbH, Germany) preoperatively and at each postoperative visit. RESULTS: Preoperatively, the mean straylight measurement was 1.16 ± 0.16. After SMILE, the mean straylight values were 1.12 ± 0.14 and 1.13 ± 0.13 at days 7 and 14, which were significantly reduced compared to preoperative values (p ≤ 0.028). Straylight returned to baseline by week 3 (p = 0.160) and remained stable onwards (p = 0.651). A lower ablation ratio was associated with less straylight level at days 1, 3, 14 and 21 (p ≤ 0.0497) in the multivariable regression model. Likewise, better visual acuity was associated with lower straylight at days 7, 14 and 28 postoperatively (p ≤ 0.038). A small proportion of eyes (range: 0-12.86%) had ≥0.30 log(s) increase in postoperative straylight within the first month after SMILE. CONCLUSIONS: SMILE induced a temporary decrease in straylight. It gradually returned to the preoperative level, which could be related to a number of dynamic processes during corneal healing. In the small proportion of patients with an increase in straylight postoperatively, this can affect their visual recovery during the early postoperative period.
PURPOSE: To investigate the postoperative straylight changes during the visual recovery phase after small incision lenticule extraction (SMILE) and their association. METHODS: Seventy consecutive eyes from 37 patients with a mean age of 30.92 ± 7.26 years and a mean preoperative spherical equivalent of -5.24 ± 1.90 dioptres undergoing myopic or myopic astigmatism SMILE correction were included in this prospective study. Patients were followed up at days 1, 3, 7, 14, 21 and 28 after standard SMILE. Straylight was measured using the C-Quant straylight meter (Oculus GmbH, Germany) preoperatively and at each postoperative visit. RESULTS: Preoperatively, the mean straylight measurement was 1.16 ± 0.16. After SMILE, the mean straylight values were 1.12 ± 0.14 and 1.13 ± 0.13 at days 7 and 14, which were significantly reduced compared to preoperative values (p ≤ 0.028). Straylight returned to baseline by week 3 (p = 0.160) and remained stable onwards (p = 0.651). A lower ablation ratio was associated with less straylight level at days 1, 3, 14 and 21 (p ≤ 0.0497) in the multivariable regression model. Likewise, better visual acuity was associated with lower straylight at days 7, 14 and 28 postoperatively (p ≤ 0.038). A small proportion of eyes (range: 0-12.86%) had ≥0.30 log(s) increase in postoperative straylight within the first month after SMILE. CONCLUSIONS: SMILE induced a temporary decrease in straylight. It gradually returned to the preoperative level, which could be related to a number of dynamic processes during corneal healing. In the small proportion of patients with an increase in straylight postoperatively, this can affect their visual recovery during the early postoperative period.
Authors: Maartje C J van Bree; Hedwig P van Verre; Marina T Devreese; Frans Larminier; Thomas J T P van den Berg Journal: Ophthalmology Date: 2011-01-13 Impact factor: 12.079
Authors: Tina Bal; Tanja Coeckelbergh; Jan Van Looveren; Jos J Rozema; Marie-José Tassignon Journal: Ophthalmologica Date: 2010-09-24 Impact factor: 3.250
Authors: Melissa D Bailey; G Lynn Mitchell; Deepinder K Dhaliwal; Brian S Boxer Wachler; Karla Zadnik Journal: Ophthalmology Date: 2003-07 Impact factor: 12.079
Authors: Ronald R Krueger; Ivey L Thornton; Meng Xu; Zsolt Bor; Thomas J T P van den Berg Journal: Ophthalmology Date: 2007-12-27 Impact factor: 12.079
Authors: Steve C Schallhorn; David J Tanzer; Sandor E Kaupp; Mitch Brown; Stephanie E Malady Journal: Ophthalmology Date: 2009-04 Impact factor: 12.079