Descriptive analysis of the type and design of contact lenses fitted according to keratoconus severity and morphology

Lunardi, L.; Arroyo, D. Jacqueline; Sobrinho, Marcelo Vicente de Andrade; Lipener, César; Rosa, Juliana Maria da Silva

doi:10.5935/0004-2749.20160025

Cited by 12 publications

(14 citation statements)

References 7 publications

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“…Another basic parameter of a CL is its base curve. Attending to this detail, RGPCL fitted the range from standard monocurve, bicurve, or multicurve lenses [ 34 , 35 ] to reverse geometry lenses [ 36 ] or specific curvature designs such as those developed by Rose [ 37 ] or implemented in the IKone lenses [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Nonsurgical Procedures for Keratoconus Management

Rico-del-Viejo

García-Montero

Hernández-Verdejo

et al. 2017

Journal of Ophthalmology

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Objectives To describe the past 20 years' correction modalities for keratoconus and their visual outcomes and possible complications. Methods A review of the published literature related to the visual outcomes and possible complications in the context of keratoconus management using nonsurgical procedures for the last 20 years (glasses and contact lenses) was performed. Original articles that reported the outcome of any correction modalities of keratoconus management were reviewed. Results The most nonsurgical procedure used on keratoconus management is the contact lens fitting. Soft contact lenses and soft toric contact lenses, rigid gas-permeable contact lenses, piggyback contact lens system, hybrid contact lenses, and scleral and corneoscleral contact lenses form the contemporary range of available lens types for keratoconus management with contact lenses. All of them try to restore the vision, improve the quality of life, and delay surgical procedures in patients with this disease. Complications are derived from the intolerance of using contact lens, and the use of each depends on keratoconus severity. Conclusions In the context of nonsurgical procedures, the use of contact lenses for the management of keratoconic patients represents a good alternative to restore vision and improve the quality of live in this population.

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Section: Resultsmentioning

confidence: 99%

Nonsurgical Procedures for Keratoconus Management

Rico-del-Viejo

García-Montero

Hernández-Verdejo

et al. 2017

Journal of Ophthalmology

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“…Likewise, in early stages of keratoconus, the manifest refraction of these patients shows an increase in both myopia and irregular astigmatism, commonly ranging between 2.00 and 8.00 D, with absence of parallelism of keratometry mires with a mean corneal power under 52.00 D (Table 1) [7]. Although RGP lenses are still the best choice to improve visual performance in patients with moderate keratoconus, different available designs of RGP contact lenses and their proficiency of centration in proportion with corneal topography is challenging [18]. Our goal in this study was to show that each RGP contact lens reduced aberrations by different mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Comparison of ocular aberrations in three types of rigid gas permeable lenses in keratoconus patients

Torkman

Khabazkhoob

Kangari

et al. 2020

rjo

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Purpose: To determine the effect of different types of Rigid Gas Permeable (RGP) contact lenses on ocular aberrations in patients with keratoconus. Methods: Eighteen eyes of young patients with mild to moderate keratoconus were selected. General ocular examinations such as refraction, visual acuity, and ocular aberrations were performed. Three types of RGP contact lenses, i.e., Boston, Senso Select and Wohlk, were fitted using the cross over method. Repeated measures analysis of variance and Mauchly's test of sphericity were used to compare the average of residual high order aberrations and visual acuity after fitting each type of lens. Results: Vertical coma was -0.271 ± 0.37 µm before fitting and decreased to 0.081 ± 0.08 µm with Boston, 0.098 ± 0.08 µm with Senso Select and 0.124 ± 0.08 µm with Wohlk contact lens (P-value < 0.0001). The mean RMS (root mean square) for high order aberrations decreased from 0.526 ± 0.43 µm before fitting to 0.256 ± 0.09 µm with Boston, 0.263 ± 0.12 µm with Senso Select, and 0.304 ± 0.10 µm with Wohlk contact lens (P-value= 0.001). The mean RMS for low order aberrations decreased from 1.480 ± 0.78 µm before fitting to 0.703 ± 0.43 µm with Boston, 0.802 ± 0.39 µm with Senso Select, and 0.760 ± 0.45µm with Wohlk (P-value < 0.0001). Conclusion: Despite achieving optimal fit and good visual acuity with these different RGP lenses, in keratoconus patients, their performance is different in reducing ocular aberrations.

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“…Monocurve RGPs are used in mild to medium KC, and multicurve CLs are used in advanced KC. However, in some advanced KC, fitting of corneal RGPs may be more difficult and lens decentralization, dislocation, and disconfort may be encountered [33].…”

Section: Rigid Gas Permeable Contact Lensesmentioning

confidence: 99%

“…Modern HCLs are indicated when there is RGP intolerance or poor centralization, when an optimal RGP fit cannot be achieved, when there is reduced daily wearing time of RGP. They have also been shown to help improve vision after keratoplasty [33,50]. Since these lenses with central RGP function and have soft peripheral skirt, they provide comfort as well as correcting vision.…”

Section: Hybrid Contact Lensesmentioning

confidence: 99%

Advances in Non-surgical Treatment Methods in Vision Rehabilitation of Keratoconus Patients

Muhafız¹

2021

Eyesight and Medical Image Cognition - Recent Advances and New Perspectives [Working Title]

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Visual acuity decreases due to progressive irregular astigmatism in keratoconus (KC). Although glasses can be useful in the initial stages of vision rehabilitation, contact lenses (CL) are needed in many patients due to irregular astigmatism. Although rigid gas permeable (RGP) CLs provided the patient with a better visual acuity than glasses, their effects on corneal tissues and caused comfort problems. Although soft CL produced for KC have solved some of these problems, they could not increase visual acuity as much as RGPs in advanced stage KC. For this reason, new searches for vision rehabilitation and comfort in KC have continued. In this context, piggyback contact lenses (PBCL) have been used in vision rehabilitation. Hybrid CLs have gained popularity due to the fact that PBCLs cause corneal neovascularization and giant papillary conjunctivitis. Scleral CLs have been developed for limited benefit in some patients with advanced KC. Scleral CLs provided good vision rehabilitation. The biggest problem of scleral CLs is the application and removal difficulty. All these CL modalities try to improve the quality of life and delay surgical procedures by increasing the level of vision in patients with KC.

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Descriptive analysis of the type and design of contact lenses fitted according to keratoconus severity and morphology

Cited by 12 publications

References 7 publications

Nonsurgical Procedures for Keratoconus Management

Nonsurgical Procedures for Keratoconus Management

Comparison of ocular aberrations in three types of rigid gas permeable lenses in keratoconus patients

Advances in Non-surgical Treatment Methods in Vision Rehabilitation of Keratoconus Patients

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