Corneal Scheimpflug Densitometry Following Photorefractive Keratectomy in Myopic Eyes

Pankert, Marie Boulze; Dariel, R.; Hoffart, L.

doi:10.3928/1081597x-20160720-02

Cited by 27 publications

(15 citation statements)

References 12 publications

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“…In normal corneas, densitometry values are derived from the total cornea with the corneal epithelium as the greatest contributor [23]. In this study, a baseline value (preoperative densitometry) of 13.31 ± 0.99 GSU was in agreement with findings from recent studies [25, 26]. In the first 24 h, SMILE significantly increased corneal densitometry and all sites of densitometry peak values located in the wounded area.…”

Section: Discussionsupporting

confidence: 90%

Small Incision Lenticule Extraction for Correction of Myopia and Myopic Astigmatism: First 24-Hour Outcomes

Liu

Dan

Luo

2017

Journal of Ophthalmology

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Purpose To observe the first 24-hour (h) outcomes of the small incision lenticule extraction procedure (SMILE) for myopia and myopic astigmatism. Methods Fifty-three eyes (27 patients) scheduled for SMILE were followed immediately (0 h), 2, 4, 6, and 24 h after SMILE. Uncorrected visual acuity (UCVA), conjunctival congestion, pain level, and corneal edema, thickness, and densitometry were recorded. Results At 2 h after SMILE, 15.1% of eyes had ≤0.1 LogMAR UCVA; this increased to 62.3%, 98.1%, and 100% at 4, 6, and 24 h, respectively. Some eyes (33.96%) had mild corneal edema immediately after surgery. No 6 h postoperative edema was observed. In the first 24 h after SMILE, corneal thickness gradually decreased. Postoperative corneal densitometry values were significantly higher than preoperative values but gradually decreased during the first postoperative 24 h. Conclusions In the first postoperative 24 h, UCVA and corneal status (edema and densitometry) improved quickly.

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Section: Discussionsupporting

confidence: 90%

Small Incision Lenticule Extraction for Correction of Myopia and Myopic Astigmatism: First 24-Hour Outcomes

Liu

Dan

Luo

2017

Journal of Ophthalmology

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“…In the present study, CD at all examined zones decreased significantly at 5 years postoperatively compared with baseline in both SMILE and FS-LASIK groups. Previous literature has shown that CD was decreased at 3 months ( 16 ) and 1 year ( 17 ) after photorefractive keratectomy (PRK). Lazaridis et al ( 8 ) and Han et al ( 4 ) compared the changes in CD after SMILE and FS-LASIK and reported a significant decrease at 3 months and 3 years after either procedure.…”

Section: Discussionmentioning

confidence: 99%

Corneal Densitometry After Small Incision Lenticule Extraction (SMILE) and Femtosecond Laser-Assisted LASIK (FS-LASIK): 5-Year Prospective Comparative Study

Wei

Yang

et al. 2020

Front. Med.

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Purpose: To investigate long-term changes in corneal densitometry (CD) following small incision lenticule extraction (SMILE) vs. femtosecond laser-assisted LASIK (FS-LASIK) in patients with myopia or myopic astigmatism. Methods: Prospective analysis was performed in 66 eyes of 38 patients (13 males) who underwent SMILE and 54 eyes of 29 patients (5 males) who underwent FS-LASIK. In all patients, an ocular examination was performed preoperatively, and at 6-12 months and 5 years postoperatively. CD was obtained with the Pentacam Scheimpflug imaging system at the 0-2-mm, 2-6-mm, and 6-10-mm zones of the cornea at depth of anterior 120 µm, midcornea, and posterior 60 µm. Correlation analysis was performed between postoperative change in CD and other variables such as age, type of surgery, central corneal thickness, spherical equivalent, lenticule thickness/ablation depth, and changes in wavefront aberrations. Results: At postoperative 6-12 months, a significant reduction at several corneal zones in the FS-LASIK cohort (P < 0.05) was observed. In the SMILE cohort, no significant change in CD relative to baseline was observed. However, at 5 years postoperatively, in both groups, a significant decrease in CD was observed in three zones of three layers (all P < 0.001). The change in CD was similar between groups at postoperative 6-12 months, but at 5 years the magnitude of change was significantly smaller in SMILE than FS-LASIK in the anterior and central layers (all P < 0.05). Conclusion: CD with the Scheimpflug imaging system showed a significant decrease at 5 years after SMILE or FS-LASIK, and the change was significantly less pronounced after SMILE.

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“…Scheimpflug densitometry is an objective, non-invasive method of measuring corneal density and thickness, providing quantitative maps with excellent repeatability [5,[44][45][46][47][48]. Scheimpflug devices also provide information on corneal curvature across the corneal surface.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

Junior

Augusto²,

Gracitelli

et al. 2020

Vision

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Evaluate the effect of corneal thickness, densitometry and curvature on intraocular pressure (IOP) measurements obtained by Goldmann applanation tonometry (GAT), non-contact tonometry (NCT), rebound tonometry (RT), and dynamic contour tonometry (DCT). A cross-sectional prospective study involving 40 participants was performed. Corneal measurements were obtained using Pentacam (Oculus GMbH, Wetzlar, Germany), densitometry was measured at annuli of 0–2, 2–6, 6–10 and 10–12 mm. The relationship between corneal thickness (central, 4 and 6 mm), corneal astigmatism and corneal densitometry and IOP was examined. There was a significant relationship between corneal thickness (central, 4 and 6 mm) and GAT180, GAT90, RT, and NCT (P < 0.001 for all comparisons) but not for DCT. Higher corneal densitometry (6–10 mm and 10–12 mm zones) was associated with higher IOP from GAT180 and GAT90, and higher densitometry in the 6–10 mm zone correlated with higher IOP from NCT, however corneal densitometry increased with age. Accounting for age, the relationship between corneal densitometry and IOP measurements was not significant. In eyes with greater corneal astigmatism there was a greater difference between GAT90 and GAT180 measurements. IOP measurements may be affected by corneal thickness, densitometry and curvature. DCT was less affected by properties of the cornea compared to other devices.

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Corneal Scheimpflug Densitometry Following Photorefractive Keratectomy in Myopic Eyes

Abstract: Corneal densitometry could represent a useful objective measurement of postoperative mild corneal haze and aid in the rating and follow-up of refractive surgery. [J Refract Surg. 2016;32(11):788-791.].

Cited by 27 publications

References 12 publications

Small Incision Lenticule Extraction for Correction of Myopia and Myopic Astigmatism: First 24-Hour Outcomes

Small Incision Lenticule Extraction for Correction of Myopia and Myopic Astigmatism: First 24-Hour Outcomes

Corneal Densitometry After Small Incision Lenticule Extraction (SMILE) and Femtosecond Laser-Assisted LASIK (FS-LASIK): 5-Year Prospective Comparative Study

The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

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