Advanced epithelial mapping for refractive surgery

Khamar, Pooja; Rao, Kavita; Wadia, Kareeshma; Dalal, Ritika; Grover, Tushar; Versaci, Francesco; Gupta, Krati

doi:10.4103/ijo.ijo_2399_20

Cited by 19 publications

(18 citation statements)

References 21 publications

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“…The Arba Mosquera and Awwad study reported that the theoretical calculation of induced refractive errors varied between −1.32 and +1.27 D according to different epithelial profiles [ 13 ]. Khamar et al noted that if refractive surgery is performed with standard flap thickness in an eye with thick CET, it will lead to under-correction due to less stromal ablation [ 14 ]. A study by Guglielmetti et al also showed improvement in postoperative vision by planning the depth of epithelial ablation to treat irregular astigmatism with transepithelial PTK [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…There are some concerns regarding the correction of refractive errors with refractive surgery due to interindividual CET profile variability and the associated potential refractive effect [ 12 , 13 ]. Hence, precisely identifying refractive errors and examining the epithelial thickness maps before refractive surgery are essential to avoid under- or overcorrection and provide helpful information to measure remodeling post-corneal refractive surgery [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Biometric Determinants of Epithelial Thickness Profile Across a Wide Range of Refractive Errors

Özalp

Atalay

2022

Ophthalmol Ther

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Introduction: To evaluate the corneal epithelial thickness (CET) profiles and their correlations with axial length (AL) and anterior corneal radius of curvature (Rm F) across different refractive error groups. Methods: A total of 1225 eyes of 616 normal patients were included. CET mapping, AL, and Rm F were obtained using spectral-domain optical coherence tomography, optical biometry, and Scheimpflug corneal tomography, respectively. In the CET map, one central (2 mm), eight paracentral (2-5 mm), and eight peripheral (5-6 mm) quadrants were evaluated separately. The subjects were divided into four groups based on their refractive status: hyperopia (spherical equivalent [SE] C ?0.50 D), emmetropia (SE [ -0.50 D and \ ?0.50 D), low myopia (SE B -0.50 D and [ -3.0 D), and moderate-high myopia (SE B -3.0 D) groups. Linear mixed model analysis with Bonferroni correction was used to compare CET according to refractive error groups. The correlations

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biometric Determinants of Epithelial Thickness Profile Across a Wide Range of Refractive Errors

Özalp

Atalay

2022

Ophthalmol Ther

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“…We utilized the MS-39 (Costruzione Strumenti Oftalmici, Florence, Italy), which combines AS-OCT with Placido Rings technology. The spectral domain AS-OCT has a 3.5 micron axial resolution for tissue, with the ability to calculate the epithelial and stromal thickness maps over an 8 mm diameter [16]. Several studies [15,17] show that AS-OCT, using the MS-39, provides good reproducibility and repeatability for measurements of corneal thickness.…”

Section: Discussionmentioning

confidence: 99%

Customized versus Standard Epithelium Profiles in Transepithelial Photorefractive Keratectomy

Ortueta¹,

Rüden²,

Arba-Mosquera

2021

Optics

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Transepithelial photorefractive keratectomy (TransPRK) is an established surface ablation technique used to correct refractive errors. Using anterior segment optical coherence (AS-OCT), it is now possible to measure the epithelium thickness and input these data into the laser platform. In this study, we explore whether better results were obtained in this way. To this end, we retrospectively analyze the results from a low-myopia group treated with a customized epithelium thickness, as measured using AS-OCT, and compare them with the results from a group treated with an optimized standard epithelium thickness. The customized epithelium profile group contains more eyes with vision better than 20/20, and more eyes in this group gain one line of corrected distance visual acuity (CDVA). In conclusion, with the customized epithelium thickness, we obtain superior results using TransPRK in low-myopia corrections.

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“…This case is a notable example where topography alone is inadequate in diagnosis of subtle keratoconus and other ectatic diseases and where some combination of tomographic, biomechanical, and anterior segment OCT epithelial mapping is essential for diagnosis. 1–4 Scheimpflug imaging, for example, would show clearly the posterior float changes and extreme values in many of the calculated parameters.…”

Section: Michael Murri MDmentioning

confidence: 99%