Straylight before and after hyperopic laser in situ keratomileusis or laser-assisted subepithelial keratectomy

Lapid-Gortzak, Ruth; Linden, Jan Willem van der; Meulen, Ivanka J.E. van der; Nieuwendaal, Carla P.; Mourits, Maarten P.; Berg, Thomas

doi:10.1016/j.jcrs.2010.06.059

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Straylight measurement using the C-Quant either decreased or remained stable after corneal refractive surgery [28][29][30][31][32]. Our findings agree with a previous study that reported no significant increase in forward scattering after SMILE in 1 month; [28] however, unlike the present study, it did not report on the straylight observations within the first month.…”

Section: Discussionsupporting

confidence: 84%

“…We hypothesize that the interplay between a number of dynamic factors could explain the fluctuation of straylight observed during the early postoperative phase following SMILE: (1) neutralization of high preoperative straylight, (2) cap-stroma interface coupling, (3) absorption of intrastromal pocket fluid, (4) Bowman's layer microdistortion and corneal lamellar wound healing. Lapid-Gortzak et al [29] reported a reduction in straylight values 3 months postoperatively after myopic LASIK and laserassisted subepithelial keratectomy (LASEK), whereas these measurements remained stable after hyperopic correction [32]. Since one-third of all straylight is derived from the cornea [35], the authors hypothesized that removing a part of the cornea would reduce the straylight due to its substantial contribution.…”

Section: Discussionmentioning

confidence: 99%

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Fluctuation in straylight measurements during the visual recovery phase after small incision lenticule extraction

Wan

Tsui

Chan

2019

Eye

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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.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Fluctuation in straylight measurements during the visual recovery phase after small incision lenticule extraction

Wan

Tsui

Chan

2019

Eye

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“…In that group, it is likely that at least partial recovery of stromal cell density at four months after surgery led to an increase in the intraocular straylight value compared with the two-month value. It could also be speculated that the higher reduction in straylight in the PRK with MMC group compared with that in the PRK without MMC group is related to a higher ablation depth (higher spherical equivalent correction) (18) . However, a previous study failed to show any relationship between ocular straylight and ablation depth (21) .…”

Section: Discussionmentioning

confidence: 99%

“…The C-Quant straylight meter assesses the amount of light scattered toward the retina by a psy chophysical approach called the compensation comparison method (16,17) . Briefly, the patient was presented with two alternative forced choices and was asked to choose between the stronger of two flickers presented in controlled background lighting (18) . The test field was divided into halves: compensation light was presented to one (randomly cho sen) half of the test field, while no compensation light was presented to the other half.…”

Section: Ocular Straylightmentioning

confidence: 99%

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Torricelli¹,

Parede²,

Netto³

et al. 2016

Arquivos Brasileiros De Oftalmologia

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Purpose: To evaluate ocular straylight before and after photorefractive keratectomy (PRK) for low myopia with and without topical mitomycin (MMC) treatment. Methods: Patients who underwent PRK for low myopia were enrolled into the study. PRK without MMC was performed in 21 eyes (12 patients), whereas PRK with topical 0.02% MMC was performed in 25 eyes (14 patients). Both groups were treated using the NIDEK EC5000 excimer laser. Measurements were performed using the C-Quant straylight meter preoperatively and at two and four months postoperatively. Results: The mean patient age was 30 ± 4 years, and the mean spherical equivalent refractive error was -2.2 ± 0.75 D. The mean preoperative intraocular straylight values were 1.07 ± 0.10 in the PRK without MMC group and 1.07 ± 0.11 log(s) in the PRK with topical MMC group. At two months after surgery, there was a decrease in mean intraocular straylight values in both groups. However, a significant difference was only reached in the PRK with MMC group [0.98 ± 0.09 log(s), p=0.002] compared with preoperative values, which was likely due to a greater scatter of measurements in the PRK without MMC group [1.03 ± 0.13 log(s), p=0.082]. At four months postoperatively, ocular straylight values were not significantly different compared with those at baseline in either the PRK without MMC group [1.02 ± 0.14 log(s), p=0.26] or in the PRK with topical MMC group [1.02 ± 0.11 log(s), p=0.13]. Conclusion: PRK for low myopia decreases ocular straylight, and MMC application further reduces straylight in the early postoperative period. However, ocular straylight values do not significantly differ at four months after surgery compared with those at baseline. (1,02 ± 0,14 log(s), p=0,26) quanto no grupo com MMC tópica (1,02 ± 0,11 log(s), p=0,13). Keywords meses da cirurgia houve uma diminuição na média da dispersão de luz intraocular em ambos os grupos. Entretanto uma diferença estatisticamente significante, comparado com os valores préoperatórios, foi observada apenas no grupo PRK com MMC (0,98 ± 0,09 log(s), p=0,002), provavelmente devido as medidas com maior espalhamento de luz no grupo sem MMC (1,03 ± 0,13 log(s), p=0,082). Após 4 meses de pósoperatório, os valores de dispersão de luz não apresentavam diferença estatisticamente significantes quando comparados com os valores iniciais, tanto no grupo sem MMC Conclusão: PRK para baixa miopia diminui a dispersão de luz ocular e a aplicação de MMC contribui para uma ainda menor dispersão de luz no período pósoperatório inicial. Entretanto, quatro meses após a cirurgia a dispersão de luz intraocular não é significantemente diferente das medidas préoperatórias.Descritores: Ceratectomia fotorrefrativa; Miopia/cirurgia; Mitomicina; Cicatrização this as a troubling symptom, at least in the early postoperative period, following procedures such as photorefractive keratectomy (PRK).Disability glare is the veiling of vision due to the forward scattering of light in the eye (5,6) . Straylight is a known source of disability glare (7) . Th...

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Comparison of optical quality parameters and ocular aberrations after wavefront-guided laser in-situ keratomileusis versus wavefront-guided laser epithelial keratomileusis for myopia

Lee

Ahn

Kim

et al. 2013

Graefes Arch Clin Exp Ophthalmol

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Optical quality after refractive surgery may be influenced by not only ocular aberrations but also by scattering. Even though the accuracies of the machines used in this study to measure optical quality have yet to be proven, this study showed limited correlation among the values measured using the two different machines after refractive surgery. Therefore, for more generalized evaluation of visual function after refractive surgery, more advanced optical devices still need to be developed.

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Straylight before and after hyperopic laser in situ keratomileusis or laser-assisted subepithelial keratectomy

Abstract: Although straylight increased slightly after hyperopic LASIK and LASEK, the increase was not statistically significant. Some eyes with increased straylight had haze or interface debris. The cause of the increased straylight could not be determined in some cases.

Cited by 7 publications

References 24 publications

Fluctuation in straylight measurements during the visual recovery phase after small incision lenticule extraction

Fluctuation in straylight measurements during the visual recovery phase after small incision lenticule extraction

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Comparison of optical quality parameters and ocular aberrations after wavefront-guided laser in-situ keratomileusis versus wavefront-guided laser epithelial keratomileusis for myopia

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