Current applications and efficacy of scleral contact lenses — a retrospective study

Severinsky, Boris; Millodot, Michel

doi:10.1016/s1888-4296(10)70022-4

Cited by 34 publications

(26 citation statements)

References 16 publications

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“…These results agree well with previous studies about the improvement of VA with ScL on corneal irregularities. [16][17][18][19][20] Visual acuity is the most common method by which eye care professionals assess optical image quality; however, it may be misleading because it does not assess the visual quality related to HOAs. 6,11 The application of WFE provides quite useful information on the ocular optical quality.…”

Section: Discussionmentioning

confidence: 99%

“…4,[12][13][14] Scleral contact lens fitted after LASIK surgery is an adequate option to prescribe, especially when other contact lenses (including piggyback, hybrid, or RGP lenses) do not provide adequate VA or are not well tolerated (excessive movement and/or decentration). 15 A few studies [16][17][18][19][20] have included some cases about fitting ScL on irregular corneas after LASIK surgery. The results of their visual quality were measured in terms of improvement in VA; however, HOAs were not commonly analyzed.…”

mentioning

confidence: 99%

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Post-LASIK Visual Quality With a Corneoscleral Contact Lens to Treat Irregular Corneas

Porcar¹,

España

Montalt

et al. 2017

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Post-LASIK Visual Quality With a Corneoscleral Contact Lens to Treat Irregular Corneas

Porcar¹,

España

Montalt

et al. 2017

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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“…8,9 However, most RGP manufacturers are now directing their efforts toward developing advanced designs for use in patients with moderate-to-severe corneal distortions and severe ocular surface disease. 10 Other applications for modern scleral lenses include compensation for high refractive errors, astigmatism among others. 7,11 Short-term comfort, a protective role in severe ocular surface disease, and the possibility to fit severely distorted corneas without compromising corneal integrity are among the main benefits of such lenses.…”

mentioning

confidence: 99%

Oxygen Diffusion and Edema With Modern Scleral Rigid Gas Permeable Contact Lenses

Compañ

Oliveira

Aguilella‐Arzo

et al. 2014

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. We defined the theoretical oxygen tension behind modern scleral contact lenses (CLs) made of different rigid gas permeable (RGP) materials, assuming different thickness of the tear layer behind the lens. A second goal was to show clinically the effect of the postlens tear film on corneal swelling. METHODS.We simulated the partial pressure of oxygen across the cornea behind scleral CLs made of different lens materials (oxygen permeability Dk, 75-200 barrer) and different thickness (T av , 100-300 lm). Postlens tear film thicknesses (T post-tear ) ranging from 150 to 350 lm were considered. Eight healthy subjects were fitted randomly with a scleral lens with a thin and a thick postlens tear layer in two different sessions for a period of 3 hours under open-eye conditions.RESULTS. The CLs with less than 125 barrer of Dk and a thickness over 200 lm depleted the oxygen availability at the lens-cornea interface below 55 mm Hg for a postlens tear film of 150 lm. For a postlens tear film thickness of 350 lm, no combination of material or lens thickness will meet the criteria of 55 mm Hg. Our clinical measures of corneal edema showed that this was significantly higher (P < 0.001, Wilcoxon signed ranks test) with the thicker compared to the thinner T post-tear (mean 6 SD, 1.66 6 1.12 vs. 4.27 6 1.19%).CONCLUSIONS. Scleral RGP CLs must be comprised of at least 125 barrer of oxygen permeability and up to 200 lm thick to avoid hypoxic effects even under open eye conditions. Postlens tear film layer should be below 150 lm to avoid clinically significant edema.

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“…Though the range of wear time of 7.6 ± 2.5 for the 23.5 mm lens and 7 ± 2.9 for the 21 mm lens is similar to that found for 18 of 85 subjects in one study, 22 it is lower than reported by most other studies. The longer wear time found by two of the studies 23,24 may be due to the fact that they custom-made the lenses for each participant, whereas we used lenses in which only the central curvature, the total diameter and the back vertex power could be modified for the patients. The longer wear time reported by Vreugdenhil et al 25 could be due to the fact that they did not conduct the study with full scleral lenses but rather with semiscleral contact lenses with smaller diameters (17.2 mm).…”

Section: A Prospective Clinical Evaluation Of a New Scleral Contact Lmentioning

confidence: 99%

A Prospective Clinical Evaluation of a New Scleral Contact Lens for Patients with Distorted Corneas

Fine¹,

Gordon‐Shaag²,

Leibowitz³

et al. 2013

International Journal of Keratoconus and Ectatic Corneal Diseases

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Objectives: A prospective clinical evaluation of the physiological fit and visual performance of a novel commercially available rigid gas permeable (RGP) scleral contact lens in subjects suffering from distorted corneas is described. Materials and methods:The physiological fit and visual performance of 23.5 mm and 21 mm RGP scleral contact lenses were assessed in 14 subjects (22 eyes) and nine subjects (12 eyes), respectively. All but one participant with a distorted cornea as a result of an infection, suffered from varying grades of keratoconus. In a subset of seven subjects (8 eyes), the higher order aberrations were measured with and without the scleral lenses. Results:The 23 mm RGP scleral lens improved visual performance in 82% of the participants and eight subjects were satisfied with the lenses. The 21 mm lens improved visual performance in 83% of the participants, and four subjects were satisfied with the lenses. Subjects that were satisfied with the lenses tended to lack other forms of visual correction. In the seven subjects that were included in the substudy, the total lower order, higher order, coma, and tetrafoil root mean square were significantly reduced (p df=7 < 0.05) with the scleral contact lenses, whereas the total trefoil was not. Conclusion:RGP scleral lenses can be comfortably worn for approximately 7 hours, improve visual acuity, and reduce higher order wavefront aberrations. The lenses can be fit easily by the practitioner, though a trial lens set is necessary. The lenses are recommended in cases where other forms of visual correction can no longer be tolerated and as a long-term or temporary alternative to corneal transplant.

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Current applications and efficacy of scleral contact lenses — a retrospective study

Cited by 34 publications

References 16 publications

Post-LASIK Visual Quality With a Corneoscleral Contact Lens to Treat Irregular Corneas

Post-LASIK Visual Quality With a Corneoscleral Contact Lens to Treat Irregular Corneas

Oxygen Diffusion and Edema With Modern Scleral Rigid Gas Permeable Contact Lenses

A Prospective Clinical Evaluation of a New Scleral Contact Lens for Patients with Distorted Corneas

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