Effect of preoperative keratometry on visual outcomes after small-incision lenticule extraction for myopia

Lee, Seongjun; Bae, Sinwoo; Jung, Moonsun

doi:10.1007/s10792-021-02167-4

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…Lee et al showed overcorrection 1 month postoperatively in the flat cornea group, but with no differences after 1 year. 11 Similarly, Luft et al showed noninferior outcomes for flat and steep corneas after SMILE. 12 In this study, all 3 groups had high efficacy and safety indexes with no significant differences between the groups and were comparable with previous studies.…”

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

“…[8][9][10] Studies evaluating steep and flat corneas before a SMILE procedure have showed comparable postoperative results. 11,12 The aforementioned studies focused on myopic LASIK or SMILE and not PRK.…”

mentioning

confidence: 99%

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Photorefractive keratectomy in flat, normal, and steep corneas

Levinger,

Arnon,

Pikkel

et al. 2024

J Cataract Refract Surg

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Purpose: To compare photorefractive keratectomy (PRK) outcomes in patients with different corneal steepness. Setting: Care-Vision Laser Center, Tel-Aviv, Israel. Design: Retrospective comparative chart review. Methods: Patients included in this study underwent wavefront optimized myopic PRK between January 2013 and December 2019. Patients were divided into 3 groups based on the steepness of the cornea (steep keratometry) (flat: <42 diopters [D], normal: 42 to 46 D and steep: >46 D). One to one matching was performed to verify that baseline parameters (age, preoperative visual acuity and refractive error) were similar between groups. Primary outcome measures were: postoperative corrected/uncorrected distance visual acuity (CDVA/UDVA), efficacy index (postoperative UDVA/preoperative CDVA), safety index (postoperative CDVA/preoperative CDVA), spherical equivalence (SEQ) and cylinder. Results: After matching, 650 eyes were included in each group, which were similar in baseline parameters. There were no significant postoperative differences between flat, normal, and steep corneas in terms of safety index (1.02 vs 1.03 vs 1.03, P = .28), efficacy index (1.01 vs 1.01 vs 1.02, P = .57), logMAR CDVA (0.01 vs 0.02 vs 0.01, P = .76), logMAR UDVA (0.02 vs 0.03 vs 0.02, P = .68), %SEQ within 0.50 D (73.9% vs 74.2% vs 74.6%, P = .95) or 1.00 D of target (91.9% vs 92.5% vs 92.2%, P = .92), %cylinder within 0.50 D (82.8% vs 82.2% vs 81.4%, P = .81) or 1.00 D of target (96.9% vs 97.1% vs 97.2%, P = .95). Conclusions: No significant differences were found between flat, normal and steep corneas following wavefront-optimized myopic PRK. Thus, this procedure may be safely and effectively performed in both flat and steep corneas.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

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Photorefractive keratectomy in flat, normal, and steep corneas

Levinger,

Arnon,

Pikkel

et al. 2024

J Cataract Refract Surg

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“…All participants underwent comprehensive preoperative ophthalmic examinations including BCDVA measurement, with the best correction in place, using a Snellen visual acuity chart (CP-690; Nidek Co., Ltd., Gamagori Aichi, Japan), manifest and cycloplegic refraction using 1% tropicamide ophthalmic solution (Mydrax; Sina Darou, Tehran, Iran) and an auto-refractometer (Auto-Kerato-Refractometer KR-8900; Topcon Co., Tokyo, Japan), a detailed anterior segment and fundus examination using a slit lamp (Haag-Streit, Bern, Switzerland), intraocular pressure measurement (Goldmann applanation tonometer, AT-900; Haag-Streit AG, Koniz, Switzerland), pupil size measurements in mesopic luminance, and corneal topography and pachymetry performed using the Orbscan IIz topography device (Bausch and Lomb Inc., Rochester, NY, USA). According to spherical equivalent (SEQ) (sum of sphere + half the cylinder), patients were allocated to one of three subgroups: low myopia (SEQ of - 0.75 D to - 2.99 D), moderate myopia (SEQ of - 3.00 D to - 5.99 D), and high myopia (SEQ of - 6.00 D to - 9.00 D) [ 14 ].…”

Section: Methodsmentioning

confidence: 99%

Myopic regression after photorefractive keratectomy: a retrospective cohort study

Ramin,

Moallemi Rad,

Abbasi

et al. 2023

Med Hypothesis Discov Innov Ophthalmol

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Background: Myopic regression is a major complication of photorefractive keratectomy (PRK). The rates and causes vary considerably among different studies. This study aimed to investigate myopic regression at six months after myopic PRK. Methods: In this retrospective cohort study, we included all eligible patients with myopia ranging from - 0.75 to - 9 D, aged 18 to 50 years, who underwent PRK by a single surgeon with the availability of preoperative and postoperative data at six months after the initial procedure. All participants underwent comprehensive ophthalmic examinations preoperatively and at six months post-PRK. Overcorrection was planned based on the participant’s age range to achieve the desired refractive result after PRK. All patients received the same postoperative antibiotic and steroid eye drops in a similar dosage regimen, and the contact lenses were removed after complete corneal epithelial healing. Based on the spherical equivalent of refraction six months after PRK, eyes without and with myopic regression were allocated into groups 1 and 2, respectively. Results: We included 254 eyes of 132 patients who underwent myopic PRK with a mean (standard deviation) age of 30.12 (7.48) years; 82 (62.12%) were women and 50 (37.88%) were men. The frequency of myopic regression was significantly lower in patients with younger age, lower preoperative cylindrical refraction, and lower ablation depth (all P < 0.05). Overcorrection was more successful in eyes with low myopia than in eyes with high myopia (P < 0.05). The highest frequency of myopic regression occurred in eyes with moderate myopia (25.68%), followed by eyes with high myopia (20.0%) and low myopia (6.54%). Among different age groups, patients aged less than or equal to 30 years had a lower frequency of myopic regression. The frequency of myopic regression in the different age groups was 5.0% at 18-20 years, 7.46% at 26-30 years, 12.28% at 21-25 years, 21.31% at 31-35 years, and 26.53% at 36-50 years. Conclusions: Overcorrection was more successful in eyes with low myopia than in eyes with high myopia. The success rate was higher in younger patients with lower astigmatism and ablation depths. Myopic regression was most frequent in eyes with moderate myopia, followed by those with high and low myopia. Further studies should replicate our findings over a longer follow-up period with a larger sample size before generalization is warranted.

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Study of corneal and retinal thicknesses at five years after FS-LASIK and SMILE for myopia

Li,

Qin,

et al. 2024

BMC Ophthalmol

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Effect of preoperative keratometry on visual outcomes after small-incision lenticule extraction for myopia

Cited by 4 publications

References 20 publications

Photorefractive keratectomy in flat, normal, and steep corneas

Photorefractive keratectomy in flat, normal, and steep corneas

Myopic regression after photorefractive keratectomy: a retrospective cohort study

Study of corneal and retinal thicknesses at five years after FS-LASIK and SMILE for myopia

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