The variability of corneal and anterior segment parameters in keratoconus

Mas-Aixala, Enric; Gispets, Joan; Lupón, Núria; Cardona, Genı́s

doi:10.1016/j.clae.2016.05.003

Cited by 18 publications

(16 citation statements)

References 22 publications

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“…Recent studies have used various instruments based on Scheimpflug photography to measure several anterior segment parameters in healthy and keratoconic eyes, including anterior chamber depth [4] and corneal sagittal height, and new parameters have been recently introduced, such as the DL distance, defined as the distance from the endpoint of the sagittal height to the anterior surface of the lens [5]. In addition, Scheimpflug images have been used to measure corneal peripheral angles in healthy and keratoconic eyes in different corneal meridians [6].…”

Section: Introductionmentioning

confidence: 99%

“…The findings of these and similar studies [7,8] suggest that keratoconus is accompanied by central and peripheral corneal involvement and by changes in the scleral shape, adjacent to the limbus. It has also been shown that the evaluation of corneal and anterior segment parameters may be useful for the characterization of the peripheral cornea, the limbal and the near limbus scleral zone, and, therefore, to gain a better understanding of the morphological changes in keratoconus [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Anterior chamber parameters in early and advanced keratoconus. A meridian by meridian analysis

Mas-Aixala

Gispets

Lupón

et al. 2018

Contact Lens and Anterior Eye

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anterior chamber parameters in early and advanced keratoconus. A meridian by meridian analysis

Mas-Aixala

Gispets

Lupón

et al. 2018

Contact Lens and Anterior Eye

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“…CTSP values were found to be significantly higher and had a higher diagnostic value for keratoconus [20] . A study by Mas-Aixala et al [21] , in which the anterior segment and topographic parameters were used together, showed that corneal changes were present in the central and peripheral regions of keratoconus eyes.…”

Section: Discussionmentioning

confidence: 99%

Evaluating corneal changes in patients with Aort aneurysm

Akıncı¹

2018

Haydarpasa Numune Med J

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Introduction: To evaluate corneal changes in patients with aortic aneurysm. Methods: The study group (Group 1) included 63 eyes of 33 patients diagnosed with aortic aneurysm and the control group (Group 2) included 69 eyes of 35 healthy people who presented at the Ophthalmology Department. Complete ophthalmologic examination was performed and steepest keratometry measurements were taken via rotational Scheimpflug corneal tomography on the following parameters: sagittal curvature map (S steepest), central corneal thickness (CCT), minimum corneal thickness (CT min), corneal volume (CV), mean pachymetric progression index (PPI mean), minimum PPI (PPI min), maximum PPI (PPI max), maximum Ambrosio relational thickness (ART max), posterior corneal elevation (PE) and back difference elevation (BDE). Results: The groups were similar in terms of age and gender (p=0.082 and p=0.145, respectively). There was no statistically significant difference in visual acuity and intraocular pressure between the groups (p=0.471 and p=0.199 respectively). There was no statistically significant difference in Ks, Kf, Km, CT min, CCT, CV, IS , S steepest, PE, PPI mean, PPI min, PP max, and ART max values between the groups (p>0.05). BDE value was significantly higher in Group 1 (p=0.04). Discussion and Conclusion: The patients diagnosed with aortic aneurysm should be evaluated for keratoconus.

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“…However, differences in the shape of scleral limbus have been reported between normal healthy and keratoconus eyes. 12 These differences may be the reason for the common need of toric scleral lenses when fitting advanced keratoconus cases. This should be investigated further in future studies.…”

Section: Discussionmentioning

confidence: 99%

Anterior Eye Profilometry-guided Scleral Contact Lens Fitting in Keratoconus

Soto-Negro¹

2017

International Journal of Keratoconus and Ectatic Corneal Diseases

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We report the case of a 35-year-old woman diagnosed with keratoconus since she was 18 years old and wearer of corneal rigid contact lenses (CLs). We refitted the case with the fully scleral CL ICD16.5 (Paragon Vision Sciences) for obtaining not only a successful visual restoration, but also a comfortable wear. We initiated the fitting with the spherical model of the CL, but it failed due to instability of the lens. We confirmed the presence of a clear asymmetry in the anterior scleral geometry in both eyes by using the profilometer eye surface profiler (ESP, Eaglet Eye), with a difference between nasal and temporal sagittal heights of 470 and 170 µm in right and left eyes respectively. Although this profile suggested the need for the fitting of a CL with significant peripheral toricity, we followed the manufacturer's guidelines and performed a trial with a CL of moderate peripheral toricity (125 µm of difference between steep and flat meridian). The stability of the CL failed again and finally a CL with a peripheral toricity close to that measured with the profilometer was fitted. With this lens, good visual performance, lens stability, and comfort was obtained and maintained during a 1-year follow-up. This case suggests that fully scleral CLs fitting might be optimized with the use of corneo-scleral profilometers, minimizing potentially the number of trials. This potential benefit should be investigated further in future studies.

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The variability of corneal and anterior segment parameters in keratoconus

Cited by 18 publications

References 22 publications

Anterior chamber parameters in early and advanced keratoconus. A meridian by meridian analysis

Anterior chamber parameters in early and advanced keratoconus. A meridian by meridian analysis

Evaluating corneal changes in patients with Aort aneurysm

Anterior Eye Profilometry-guided Scleral Contact Lens Fitting in Keratoconus

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