Stereopsis Simulating Small-Aperture Corneal Inlay and Monovision Conditions

Castro, José J.; Ortíz, Carolina; Jiménez, José María López; Ortiz-Peregrina, Sonia; Casares-López, Miriam

doi:10.3928/1081597x-20180517-01

Cited by 13 publications

(11 citation statements)

References 26 publications

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“…Castro et al simulated the anisocoria generated by corneal inlays using a small aperture contact lens and demonstrated a significant deterioration of stereo-acuity for near and intermediate distances [ 13 ]. Also, studies with LASIK monovision demonstrated that in a proportion of these patients, stereo-acuity is lost and that once lost, it does not recover [ 11 , 14 , 15 ].…”

Section: Discussionmentioning

confidence: 99%

Functional Outcomes and Reading Speeds following PRESBYOND LBV Using Nonlinear Aspheric Ablation Profiles Combined with Micro-Monovision

Brar

Sute

Bagare

et al. 2021

Journal of Ophthalmology

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Purpose. To report the functional outcomes and reading speeds following PRESBYOND laser blended vision (LBV) using nonlinear aspheric ablation profiles with micro-monovision with the Carl Zeiss Meditec MEL 90 platform. Methods. Data have been collected retrospectively for all patients who underwent PRESBYOND LBV using the MEL 90 excimer laser. Postoperative binocular uncorrected distance and near visual acuity, stereo-acuity, contrast sensitivity, and reading performance were compared with pre-op values measured with patient’s progressive glasses. Mean follow-up was 6 ± 1.2 months. Results. Sixty eyes of 30 patients (mean age 50.47 ± 6.43 years) were included. Of these, 18 patients were hyperopic and 12 patients were myopic with mean SE of 1.28 ± 1.38 D and −2.84 ± 1.86 D, respectively. At 6 months, the mean binocular UDVA was ≥−0.03 ± 0.06 log MAR and the mean binocular UNVA was ≥0.22 ± 0.04 log MAR. The uncorrected reading speeds (words per minute) at the preferred reading distance of 46.17 cm, 60 cm, and 80 cm were significantly better ( p value <0.01), whereas the smallest letter size and reading acuities were comparable to the preoperative values ( p > 0.05 for all distances). Uncorrected contrast sensitivity log values showed mild reduction; however, this was not statistically significant for any spatial frequency. There was a significant reduction in post uncorrected stereopsis to 89.67 arc sec, compared with pre-op corrected stereopsis (50.67 arc sec); however, it recovered fully with near correction (53.33 arc sec, p > 0.05 compared with pre). Conclusion. PRESBYOND LBV resulted in significantly better reading speeds and satisfactory functional visual outcomes, without a permanent change in stereo-acuity and contrast sensitivity 6 months postoperatively.

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Section: Discussionmentioning

confidence: 99%

Functional Outcomes and Reading Speeds following PRESBYOND LBV Using Nonlinear Aspheric Ablation Profiles Combined with Micro-Monovision

Brar

Sute

Bagare

et al. 2021

Journal of Ophthalmology

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“…Specifically, we demonstrated that, compared with the SACI our proposal provides images with high intensity levels. This is important because, current inlays needs to be implanted monocularly in the non-dominant eye, with the risk of significant decline in the patient's binocular visual performance, compromising stereoacuity [8], and also binocular visual acuity because binocular summation is less effective as the interocular differences in retinal image increase. In fact, Tabernero and coworkers [23] found that, the binocular far-distance visual acuity achieved with one eye implanted with SACI comply binocular summation; but, in contrast, the visual acuity for near distance seems to match to the near distance acuity of the eye with SACI.…”

Section: Discussionmentioning

confidence: 99%

“…[7]. Another visual function compromised by this inlay is stereoacuity, which could suffer a deterioration with respect to natural conditions, especially for near and intermediate distances [8].…”

Section: Introductionmentioning

confidence: 99%

Imaging Performance of a Diffractive Corneal Inlay for Presbyopia in a Model Eye

et al. 2019

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In this work we evaluated the imaging properties of the Diffractive Corneal Inlay (DCI), a novel type of corneal implant working by diffraction that we proposed for the treatment of presbyopia. ZEMAX OpticStudio software was employed for the numerical assessment, with simulations performed in a humanbased eye model. In the ray tracing analysis, we used the Modulation Transfer Function (MTF), the Area under the MTF (AMTF), and the Point Spread Function (PSF). The theoretical performance of the DCI under different situations was evaluated in comparison with a commercially available pinhole based corneal inlay. Finally, real images were obtained experimentally in vitro in a model eye with inlays prototypes. The obtained results allow to state that the DCI exhibits a very high light throughput, improved imaging capabilities for far and near objects, and robustness against decentrations. INDEX TERMS Corneal inlays, diffractive lenses, Presbyopia, optical design.

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“…Moreover, the SACI produces marked interocular differences in visual latency and a Pulfrich effect [13]. Other visual function that is compromised by the SACI is a deterioration in stereoacuity with respect to natural conditions, especially for near and intermediate distances [14].…”

Section: Introductionmentioning

confidence: 99%

Diffractive Corneal Inlays: A New Concept for Correction of Presbyopia

Montagud-Martínez¹,

Ferrando²,

García-Delpech³

et al. 2020

Visual Impairment and Blindness - What We Know and What We Have to Know

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A new class of corneal inlays for treatment of presbyopia is described, which uses diffraction as the working principle. The inlay consists of an opaque disk with a small central aperture surrounded by an array of micro-holes that are distributed following the order of a given Fresnel zone plate having N zones. In this way, the central hole of the disk produces an extension of the depth of focus of the eye for distance vision and contributes to the zero order of diffraction, and the light diffracted by the micro-holes in the periphery produces a real focus for near vision. In our general design, the number of zones and the diameter of the central hole are free parameters that can be used to design customized devices with different addition power and near-focus intensity. Two different designs are analyzed to show this property. In the analysis, we employed a ray tracing software to study the performance of the new inlays in the two different model eyes. The results are compared with those obtained with a model of the small-aperture inlay that is currently in the market. The different merit functions used in the comparison and the image simulations performed with the inlays in the model eyes show the excellent performance of our proposal.

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Stereopsis Simulating Small-Aperture Corneal Inlay and Monovision Conditions

Abstract: The deterioration of stereopsis and other binocular functions found in this study may be acceptable for patients who had this surgical technique because it is similar to the deterioration found in other surgical procedures of emmetropization. [J Refract Surg. 2018;34(7):482-488.].

Cited by 13 publications

References 26 publications

Functional Outcomes and Reading Speeds following PRESBYOND LBV Using Nonlinear Aspheric Ablation Profiles Combined with Micro-Monovision

Functional Outcomes and Reading Speeds following PRESBYOND LBV Using Nonlinear Aspheric Ablation Profiles Combined with Micro-Monovision

Imaging Performance of a Diffractive Corneal Inlay for Presbyopia in a Model Eye

Diffractive Corneal Inlays: A New Concept for Correction of Presbyopia

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