Differences in corneo-scleral topographic profile between healthy and keratoconus corneas

Piñero, David P.; Martínez‐Abad, Antonio; Soto-Negro, Roberto; Ruiz-Fortes, Pedro; Pérez-Cambrodí, Rafael J.; Ariza-Gracia, Miguel Ángel; Carracedo, Gonzalo

doi:10.1016/j.clae.2018.05.005

Cited by 34 publications

(41 citation statements)

References 27 publications

(56 reference statements)

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“…However, it must be noted that when corneal thickness is subtracted from ACD values, that is, when the reference point for measurements is the endothelium, the it may be concluded that the changes produced by the emergence of keratoconus not only affect the corneal portion of the eye, but the entire anterior segment, as previously suggested [6,7]. Indeed, Piñero et al [7], using the recently available corneo-scleral topographer Eye Surface Profiler (Eaglet Eye b.v., Houten, The Netherlands) also reported significant correlations between several corneal and scleral parameters, particularly in those patients presenting more advanced keratoconus. Our findings also…”

Section: Ocular Conditionmentioning

confidence: 96%

“…In addition, Scheimpflug images have been used to measure corneal peripheral angles in healthy and keratoconic eyes in different corneal meridians [6]. 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: 93%

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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: Ocular Conditionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 93%

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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show abstract

“…The authors also concluded that higher corneal astigmatism (>2.00D) could be associated with scleral toricity. Other studies found that the scleral topography of irregular and regular shaped corneas have differences, which could have a direct impact on SL fitting, namely when choosing the best landing zone geometry for the different eyes [26–28].…”

Section: Discussionmentioning

confidence: 99%

Practitioner Learning Curve in Fitting Scleral Lenses in Irregular and Regular Corneas Using a Fitting Trial

Macedo-de-Araújo

Worp²,

González-Meijóme

2019

BioMed Research International

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Purpose. To assess the learning curve of a novel practitioner with minor previous experience with scleral lenses (SL) fitting in the initial 156 consecutive fittings in irregular and regular corneas using a fitting trial.Methods. Prospective dispensing case series involving a total of 85 subjects (156 eyes), 122 eyes with irregular corneas (IC Group) and 34 eyes with regular corneas (RC Group). All lenses were fitted by the same practitioner with minimal previous knowledge and practice on SL fitting. The first 156 consecutive fits were studied to estimate the number of trial lenses required to achieve the optimal fit and the number of reorders required. The results were divided into 8 chronological groups of 20 fittings (eyes) each.Results. There was a decrease in the number of trial lenses required to achieve the optimal fit from 2.35±0.18 lenses in the first 20 fittings to 1.56±0.13 in the last fittings (p<0.05, Wilcoxon). There were no statistically significant differences between IC and RC groups. Regarding the number of reorders, there was also a decrease from 0.95±0.17 in the first fittings to 0.25±0.11 in the last fittings (p<0.05, Wilcoxon). Thought not statistically significant, there was an increase in the use of toric designs with increasing experience.Conclusions. Practitioner fitting experience reduced both the number of trial lenses required to achieve the best fit and the number of reorders with time. After the first 60 cases, there was a significant reduction in the trial lenses and reorders necessity.

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“…Although SL are very stable on-eye, they tend to decenter. e geometric characteristics of the ocular surface beyond the corneal borders (flatter sclera in the nasal side), gravity, and eyelids effect usually make the SL to decenter inferotemporally [24][25][26][27][28][29]. However, some manufacturers are able to overcome this issue by decentering the optic zone to compensate for this misalignment with the visual axis, which could be very beneficial for presbyopic and myopia control designs.…”

Section: Platforms For Bifocality and Multifocality In Contact Lensesmentioning

confidence: 99%

Bifocal and Multifocal Contact Lenses for Presbyopia and Myopia Control

Remón

Pérez-Merino

Macedo-de-Araújo

et al. 2020

Journal of Ophthalmology

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Bifocal and multifocal optical devices are intended to get images into focus from objects placed at different distances from the observer. Spectacles, contact lenses, and intraocular lenses can meet the requirements to provide such a solution. Contact lenses provide unique characteristics as a platform for implementing bifocality and multifocality. Compared to spectacles, they are closer to the eye, providing a wider field of view, less distortion, and their use is more consistent as they are not so easily removed along the day. In addition, contact lenses are also minimally invasive, can be easily exchangeable, and, therefore, suitable for conditions in which surgical procedures are not indicated. Contact lenses can remain centered with the eye despite eye movements, providing the possibility for simultaneous imaging from different object distances. The main current indications for bifocal and multifocal contact lenses include presbyopia correction in adult population and myopia control in children. Considering the large numbers of potential candidates for optical correction of presbyopia and the demographic trends in myopia, the potential impact of contact lenses for presbyopia and myopia applications is undoubtedly tremendous. However, the ocular characteristics and expectations vary significantly between young and older candidates and impose different challenges in fitting bifocal and multifocal contact lenses for the correction of presbyopia and myopia control. This review presents the recent developments in material platforms, optical designs, simulated visual performance, and the clinical performance assessment of bifocal and multifocal contact lenses for presbyopia correction and/or myopia progression control.

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Differences in corneo-scleral topographic profile between healthy and keratoconus corneas

Cited by 34 publications

References 27 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

Practitioner Learning Curve in Fitting Scleral Lenses in Irregular and Regular Corneas Using a Fitting Trial

Bifocal and Multifocal Contact Lenses for Presbyopia and Myopia Control

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