Factors Influencing the Need for Enhancement After Laser in situ Keratomileusis

Perlman, Elliot M.; Reinert, Steven E.

doi:10.3928/1081-597x-20041101-05

Cited by 32 publications

(7 citation statements)

References 12 publications

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“…Some reports have found that age is a factor, with younger patients having better outcomes, but other studies have not found an association. 9,19,20 In addition, studies of the possible benefi t of femtosecond-created LASIK fl aps have shown both similar and improved outcomes compared to mechanical keratome-created fl aps. 4,[21][22][23][24] Given these mixed results, it is not known whether patients who did not attend the 1-month examination would have collectively done better, worse, or the same as the cohort who attended the 1-month examination.…”

Section: Snellen Linesmentioning

confidence: 99%

One-month Outcomes of Wavefront-guided LASIK for Low to Moderate Myopia With the VISX STAR S4 Laser in 32,569 Eyes

Schallhorn¹,

Venter²

2009

J Refract Surg

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Section: Snellen Linesmentioning

confidence: 99%

One-month Outcomes of Wavefront-guided LASIK for Low to Moderate Myopia With the VISX STAR S4 Laser in 32,569 Eyes

Schallhorn¹,

Venter²

2009

J Refract Surg

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“…In a young myopic patient with low to moderate myopia, regression can be avoided to a good extent and safely by using a post lasik aim of refraction of +1.0 D. From this study it is obvious that this safe margin of hypermetropia (SMH) considered safe because it is easily overcomed by accommodation so that doesn't impair UCVA, not cause significant eyestrain (asthenopia), play a good role in decreasing regression and preventing shift of refraction to myopic side. This simple maneuver of choosing safe margin of hypermetropia (SMH) can help dramatically to eliminate the need to enhancement procedure (12)(13)(14) and help to reach a good level of patient trust and satisfaction.…”

Section: Resultsmentioning

confidence: 99%

The Role Of Safe Margin Of Hypermetropia In Protection Against Post Lasik Regression In Myopic Patients

2019

University of Thi-Qar Journal of Medicine

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Purpose:To determine post lasik aim of refraction in young myopic patient that ensure slight over correction (safe margin of hypermetropiaSMH) which help in reducing possibility of regressionand post lasik myopic shift, however this SMH should be easily overcomedby accommodation , doesn't affect UCVA or induce eyestrain. Patients and methods:400 patients (800 eyes) were taken in this study, all of them had myopia and myopic astigmatism with-1.0 to-6.0 D(spherical equivalent) during the period between 2008-2014 in Nassirya city, south of Iraq. Those patients were divided into 5 groups each group with 80 patients (160 eyes) and planned to have post lasik refraction ofemmetrope, +0.5, +0.75, +1.0 and +1.25 D, for groups from no.1 to no.5 respectively and these groups followed up in term of UCVA, spherical equivalent, myopic shift, and asthenopia (eyestrain) for three years. Result:Three yearsfollow up for the 5 groups showed that, in group no.1 (27.5%) of eyes had VA of 6/9 or worse, (33.125%) of eyes had myopic shift and(11.25%) of patients had eyestrain. In group no.2 (19.375%) of eyes had VA of 6/9 or worse (21.875%) of eyes had myopic shift and (8.75%) of patients had eyestrain. In group no.3 (11.25%)of eyes had VA of 6/9 or worse (9.375%) of eyes had myopic shift and (2.5%) of patients had eyestrain. In group no.4 (4.375%) of eyes had VA of 6/9 or worse, no myopic shift and (2.5%) of patients had eyestrain. In group no.5(12.5%) of eyes had VA of 6/9 or worse, no myopic shift and (15%) of patients had eye strain. Conclusion: In young myopic patients with low to moderate myopia, we can choose post lasik aim of refraction of +1.0 D, this safe margin of hypermetropia SMH can ensure best UCVA without eyestrain (asthenopia), help in reducing regression and myopic shift.

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“…Previous reports [2,5,36] indicated that older-aged patients are more likely to develop regression or require retreatment, as was found in the multivariate analysis in our study. One explanation is that surgeons are careful to undercorrect with myopic presbyopia with patients who are around 40 years of age, while they tend to overcorrect for young patients [41]. The second explanation is that the lenses of older patients might develop lenticular sclerosis with a myopic shift.…”

Section: Agementioning

confidence: 99%

Predictors affecting myopic regression in − 6.0D to − 10.0D myopia after laser-assisted subepithelial keratomileusis and laser in situ keratomileusis flap creation with femtosecond laser-assisted or mechanical microkeratome-assisted

Zhou

Gu²,

Li³

et al. 2019

Int Ophthalmol

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Purpose To investigate the predictive factors of postoperative myopic regression among subjects who have undergone laser-assisted subepithelial keratomileusis (LASEK), laser-assisted in situ keratomileusis (LASIK) flap created with a mechanical microkeratome (MM), and LASIK flap created with a femtosecond laser (FS). All recruited patients had a manifest spherical equivalence (SE) from − 6.0D to − 10.0D myopia. Methods This retrospective, observational case series study analyzed outcomes of refraction at 1 day, 1 week, and 1, 3, 6, and 12 months postoperatively. Predictors affecting myopic regression and other covariates were estimated with the Cox proportional hazards model for the three types of surgeries. Results The study enrolled 496 eyes in the LASEK group, 1054 eyes in the FS-LASIK group, and 910 eyes in the MM-LASIK group. At 12 months, from − 6.0D to − 10.0D myopia showed that the survival rates (no myopic regression) were 52.19%, 59.12%, and 58.79% in the MM-LASIK, FS-LASIK, and LASEK groups, respectively. Risk factors for myopic regression included thicker postoperative central corneal thickness (P ≦ 0.01), older age (P ≦ 0.01), aspherical ablation (P = 0.02), and larger transitional zone (TZ) (P = 0.03). Steeper corneal curvature (Kmax) (P = 0.01), thicker preoperative central corneal thickness (P < 0.01), smaller preoperative myopia (P < 0.01), longer duration of myopia (P = 0.02), with contact lens (P < 0.01), and larger optical zone (OZ) (P = 0.02) were protective factors. Among the three groups, the MM-LASIK had the highest risk of postoperative myopic regression (P < 0.01). Conclusions The MM-LASIK group experienced the highest myopic regression, followed by the FS-LASIK and LASEK groups. Older age, aspheric ablation used, thicker postoperative central corneal thickness, and enlarging TZ contribute to myopic regression; steeper preoperative corneal curvature (Kmax), longer duration of myopia, with contact lens, thicker preoperative central corneal thickness, lower manifest refraction SE, and enlarging OZ prevent postoperative myopic regression in myopia from − 6.0D to − 10.0D.

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Factors Influencing the Need for Enhancement After Laser in situ Keratomileusis

Cited by 32 publications

References 12 publications

One-month Outcomes of Wavefront-guided LASIK for Low to Moderate Myopia With the VISX STAR S4 Laser in 32,569 Eyes

One-month Outcomes of Wavefront-guided LASIK for Low to Moderate Myopia With the VISX STAR S4 Laser in 32,569 Eyes

The Role Of Safe Margin Of Hypermetropia In Protection Against Post Lasik Regression In Myopic Patients

Predictors affecting myopic regression in − 6.0D to − 10.0D myopia after laser-assisted subepithelial keratomileusis and laser in situ keratomileusis flap creation with femtosecond laser-assisted or mechanical microkeratome-assisted

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