Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap

Antonio Leccisotti, Stefania V Fields, Johnny Moore, Sunil Shah, Tara C B Moore

Research output: Contribution to journalArticle

Abstract

PURPOSE: To evaluate ocular biomechanical parameters with the Corvis ST, a noncontact tonometer combined with an ultra-high-speed Scheimpflug camera, before and after creation of a femtosecond laser-created laser in situ keratomileusis (LASIK) flap.

SETTING: Private practice, Siena, Italy.

DESIGN: Prospective consecutive study.

METHODS: Right eyes of patients having LASIK were assessed with the dynamic Scheimpflug camera before and after femtosecond laser (LDV Z4) flap creation but before mechanical flap lifting.

RESULTS: Twenty-eight eyes of 28 patients were evaluated. Before flap creation, the mean values on the dynamic Scheimpflug camera were intraocular pressure (IOP), 15.04 mm Hg ± 3.99 (SD); central pachymetry, 550.8 ± 101.0 μm; applanation 1 length, 1.721 ± 0.134 mm; applanation 2 length, 1.674 ± 0.287 mm; applanation 1 velocity, 0.126 ± 0.031 m/s; and deflection amplitude, 1.039 ± 0.141 mm. After flap creation, the mean values were IOP, 16.10 ± 3.11 mm Hg (95% confidence interval [CI], 0.44-1.78; P < .05); central pachymetry, 561.8 ± 35.9 μm (95% CI, -28.9 to 50.9; P = .21); applanation 1 length, 1.789 ± 0.1492 mm (95% CI, 0.003-0.134; P < .05); applanation 2 length, 1.759 ± 0.259 mm (95% CI, -0.005 to 0.173; P = .08); applanation 1 velocity, 0.136 ± 0.022 m/s (95% CI, 0.001-0.017; P < .05); and deflection amplitude, 1.029 ± 0.151 mm (95% CI: -0.043 to 0.025; P = .34).

CONCLUSION: The dynamic Scheimpflug camera showed changes in biomechanical properties after femtosecond creation of a LASIK flap as indicated by an increased applanation 1 length and applanation 1 velocity.

FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

Original languageEnglish
Pages (from-to)127-131
Number of pages5
JournalJournal of Cataract and Refractive Surgery
Volume42
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

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Laser In Situ Keratomileusis
Biomechanical Phenomena
Lasers
Confidence Intervals
Intraocular Pressure
Private Practice
Patient Rights
Italy
Prospective Studies

Keywords

  • Adult
  • Biomechanical Phenomena
  • Cornea/physiology
  • Corneal Pachymetry
  • Corneal Stroma/surgery
  • Corneal Topography
  • Elasticity/physiology
  • Female
  • Humans
  • Hyperopia/surgery
  • Intraocular Pressure/physiology
  • Keratomileusis, Laser In Situ/methods
  • Lasers, Excimer/therapeutic use
  • Male
  • Middle Aged
  • Myopia/surgery
  • Prospective Studies
  • Refraction, Ocular
  • Surgical Flaps
  • Tonometry, Ocular
  • Visual Acuity
  • Young Adult

Cite this

Leccisotti, Antonio ; Fields, Stefania V ; Moore, Johnny ; Shah, Sunil ; Moore, Tara C B. / Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap. In: Journal of Cataract and Refractive Surgery. 2016 ; Vol. 42, No. 1. pp. 127-131.
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title = "Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap",
abstract = "PURPOSE: To evaluate ocular biomechanical parameters with the Corvis ST, a noncontact tonometer combined with an ultra-high-speed Scheimpflug camera, before and after creation of a femtosecond laser-created laser in situ keratomileusis (LASIK) flap.SETTING: Private practice, Siena, Italy.DESIGN: Prospective consecutive study.METHODS: Right eyes of patients having LASIK were assessed with the dynamic Scheimpflug camera before and after femtosecond laser (LDV Z4) flap creation but before mechanical flap lifting.RESULTS: Twenty-eight eyes of 28 patients were evaluated. Before flap creation, the mean values on the dynamic Scheimpflug camera were intraocular pressure (IOP), 15.04 mm Hg ± 3.99 (SD); central pachymetry, 550.8 ± 101.0 μm; applanation 1 length, 1.721 ± 0.134 mm; applanation 2 length, 1.674 ± 0.287 mm; applanation 1 velocity, 0.126 ± 0.031 m/s; and deflection amplitude, 1.039 ± 0.141 mm. After flap creation, the mean values were IOP, 16.10 ± 3.11 mm Hg (95{\%} confidence interval [CI], 0.44-1.78; P < .05); central pachymetry, 561.8 ± 35.9 μm (95{\%} CI, -28.9 to 50.9; P = .21); applanation 1 length, 1.789 ± 0.1492 mm (95{\%} CI, 0.003-0.134; P < .05); applanation 2 length, 1.759 ± 0.259 mm (95{\%} CI, -0.005 to 0.173; P = .08); applanation 1 velocity, 0.136 ± 0.022 m/s (95{\%} CI, 0.001-0.017; P < .05); and deflection amplitude, 1.029 ± 0.151 mm (95{\%} CI: -0.043 to 0.025; P = .34).CONCLUSION: The dynamic Scheimpflug camera showed changes in biomechanical properties after femtosecond creation of a LASIK flap as indicated by an increased applanation 1 length and applanation 1 velocity.FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.",
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author = "Antonio Leccisotti and Fields, {Stefania V} and Johnny Moore and Sunil Shah and Moore, {Tara C B}",
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Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap. / Leccisotti, Antonio; Fields, Stefania V; Moore, Johnny; Shah, Sunil; Moore, Tara C B.

In: Journal of Cataract and Refractive Surgery, Vol. 42, No. 1, 01.01.2016, p. 127-131.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap

AU - Leccisotti, Antonio

AU - Fields, Stefania V

AU - Moore, Johnny

AU - Shah, Sunil

AU - Moore, Tara C B

PY - 2016/1/1

Y1 - 2016/1/1

N2 - PURPOSE: To evaluate ocular biomechanical parameters with the Corvis ST, a noncontact tonometer combined with an ultra-high-speed Scheimpflug camera, before and after creation of a femtosecond laser-created laser in situ keratomileusis (LASIK) flap.SETTING: Private practice, Siena, Italy.DESIGN: Prospective consecutive study.METHODS: Right eyes of patients having LASIK were assessed with the dynamic Scheimpflug camera before and after femtosecond laser (LDV Z4) flap creation but before mechanical flap lifting.RESULTS: Twenty-eight eyes of 28 patients were evaluated. Before flap creation, the mean values on the dynamic Scheimpflug camera were intraocular pressure (IOP), 15.04 mm Hg ± 3.99 (SD); central pachymetry, 550.8 ± 101.0 μm; applanation 1 length, 1.721 ± 0.134 mm; applanation 2 length, 1.674 ± 0.287 mm; applanation 1 velocity, 0.126 ± 0.031 m/s; and deflection amplitude, 1.039 ± 0.141 mm. After flap creation, the mean values were IOP, 16.10 ± 3.11 mm Hg (95% confidence interval [CI], 0.44-1.78; P < .05); central pachymetry, 561.8 ± 35.9 μm (95% CI, -28.9 to 50.9; P = .21); applanation 1 length, 1.789 ± 0.1492 mm (95% CI, 0.003-0.134; P < .05); applanation 2 length, 1.759 ± 0.259 mm (95% CI, -0.005 to 0.173; P = .08); applanation 1 velocity, 0.136 ± 0.022 m/s (95% CI, 0.001-0.017; P < .05); and deflection amplitude, 1.029 ± 0.151 mm (95% CI: -0.043 to 0.025; P = .34).CONCLUSION: The dynamic Scheimpflug camera showed changes in biomechanical properties after femtosecond creation of a LASIK flap as indicated by an increased applanation 1 length and applanation 1 velocity.FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

AB - PURPOSE: To evaluate ocular biomechanical parameters with the Corvis ST, a noncontact tonometer combined with an ultra-high-speed Scheimpflug camera, before and after creation of a femtosecond laser-created laser in situ keratomileusis (LASIK) flap.SETTING: Private practice, Siena, Italy.DESIGN: Prospective consecutive study.METHODS: Right eyes of patients having LASIK were assessed with the dynamic Scheimpflug camera before and after femtosecond laser (LDV Z4) flap creation but before mechanical flap lifting.RESULTS: Twenty-eight eyes of 28 patients were evaluated. Before flap creation, the mean values on the dynamic Scheimpflug camera were intraocular pressure (IOP), 15.04 mm Hg ± 3.99 (SD); central pachymetry, 550.8 ± 101.0 μm; applanation 1 length, 1.721 ± 0.134 mm; applanation 2 length, 1.674 ± 0.287 mm; applanation 1 velocity, 0.126 ± 0.031 m/s; and deflection amplitude, 1.039 ± 0.141 mm. After flap creation, the mean values were IOP, 16.10 ± 3.11 mm Hg (95% confidence interval [CI], 0.44-1.78; P < .05); central pachymetry, 561.8 ± 35.9 μm (95% CI, -28.9 to 50.9; P = .21); applanation 1 length, 1.789 ± 0.1492 mm (95% CI, 0.003-0.134; P < .05); applanation 2 length, 1.759 ± 0.259 mm (95% CI, -0.005 to 0.173; P = .08); applanation 1 velocity, 0.136 ± 0.022 m/s (95% CI, 0.001-0.017; P < .05); and deflection amplitude, 1.029 ± 0.151 mm (95% CI: -0.043 to 0.025; P = .34).CONCLUSION: The dynamic Scheimpflug camera showed changes in biomechanical properties after femtosecond creation of a LASIK flap as indicated by an increased applanation 1 length and applanation 1 velocity.FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

KW - Adult

KW - Biomechanical Phenomena

KW - Cornea/physiology

KW - Corneal Pachymetry

KW - Corneal Stroma/surgery

KW - Corneal Topography

KW - Elasticity/physiology

KW - Female

KW - Humans

KW - Hyperopia/surgery

KW - Intraocular Pressure/physiology

KW - Keratomileusis, Laser In Situ/methods

KW - Lasers, Excimer/therapeutic use

KW - Male

KW - Middle Aged

KW - Myopia/surgery

KW - Prospective Studies

KW - Refraction, Ocular

KW - Surgical Flaps

KW - Tonometry, Ocular

KW - Visual Acuity

KW - Young Adult

UR - https://www.sciencedirect.com/science/article/pii/S0886335015012663?via%3Dihub

U2 - 10.1016/j.jcrs.2015.07.047

DO - 10.1016/j.jcrs.2015.07.047

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VL - 42

SP - 127

EP - 131

JO - Journal of Cataract and Refractive Surgery

JF - Journal of Cataract and Refractive Surgery

SN - 0886-3350

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