Retrospective Analysis of Vision Correction and Lens Tolerance in Keratoconus Patients Prescribed a Contact Lens With Dual Aspherical Curves

Yanai, Ryoji; Ueda, Kayo; Nishida, Teruo

doi:10.1097/icl.0b013e3181d13a90

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…A multitude of lenses has been developed for patients with this condition [8][9][10][11][12][13][14][15][16][17][18][19]. However, no previous study has examined a bevel toric lens, designed to improve bevel width and tear exchange efficacy, in such patients.…”

Section: Discussionmentioning

confidence: 96%

“…Individuals with keratoconus in the advanced stage require a rigid gas-permeable (RGP) contact lens to reduce distortion and provide better vision [7][8][9]. Fitting of an RGP lens improves visual acuity, and many such lenses have been developed for management of keratoconus patients [8][9][10][11][12][13][14][15][16][17][18][19]. However, RGP lenses can cause discomfort as a result of their small bevel width, which is necessitated by the difference in radius of curvature of the cornea between the vertical and horizontal directions in advanced keratoconus [20].…”

Section: Introductionmentioning

confidence: 99%

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Bevel toric multicurve rigid gas-permeable lens for keratoconus

2012

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Bevel toric multicurve rigid gas-permeable lens for keratoconus

2012

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“…Previous studies on aspherical-curve HCLs have been reported by Yanai et al [ 16 ] and Kazanci et al [ 17 ]. In the report by Yanai et al, the E value of the peripheral-zone curve design was small, and HCLs were not used for severe cases [ 16 ]. In this study, aspherical-curve HCLs were used for stages 3 and 4.…”

Section: Discussionmentioning

confidence: 99%

Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

et al. 2022

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Aspherical- and multi-curve rigid gas-permeable hard contact lenses (HCLs) have a flattened curve in the peripheral zone and are mostly used for patients with keratoconus who cannot wear glasses, soft contact lenses, or spherical HCLs. In this retrospective study, a total of 95 eyes of 77 patients who used aspherical- or multi-curve HCLs (mean age: 40.0 ± 11.0 years) were evaluated. This study examined the types of aspherical- and multi-curve HCLs, best-corrected visual acuity (BCVA) values before and after wearing HCLs, the association with the Amsler-Krumeich classification, duration of wear, corneal/conjunctival disorder, and the frequency of changing HCLs. There were 78 eyes that used aspherical-curve HCLs and 17 that used multi-curve HCLs. BCVA significantly improved from 0.42 logMAR to 0.06 logMAR after wearing either form of HCL. The Amsler-Krumeich classification showed that aspherical-curve HCLs were commonly used for patients with stage 2 keratoconus, and multi-curve HCLs were commonly used for stage 4 patients. The BCVA values were worse when the disease stage was more severe (stages 3 and 4) regardless of HCL type. The mean base curve of the lenses was steeper in multi-curve HCLs than in aspherical-curve HCLs. The more severe the disease stage, the steeper the base curve in both aspherical- and multi-curve HCLs. The duration of wear significantly improved from 2.1 h to 10.2 h, and corneal/conjunctival disorder similarly improved. The mean frequency of changing HCL types was 1.1 times. This study suggests that a flat peripheral curve design with aspherical- and multi-curve HCLs is useful for patients with keratoconus.

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“…Yanai ve ark. 13 çalışmalarında gözlükle görme keskinliğini 0,70 logMAR (20/111), kontakt lensle görme keskinliğini 0,20 logMAR (20/29) bulmuşlardır. Fatima ve ark.…”

Section: Discussionunclassified

İleri Keratokonuslu Olgularda Kontakt Lens Uygulaması: Uzun Süreli Takip Sonuçlarımız

...

2012

Tjo

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Amaç: İleri keratokonuslu gözlerde sert gaz geçirgen(SGG) kontakt lens kullanımının uzun süreli takip sonuçlarını değerlendirmek. Ge reç ve Yön tem: SGG kontakt lens uygulanan ileri keratokonuslu gözler retrospektif olarak incelendi. So nuç lar: İleri keratokonus tanısı konup gaz geçirgen kontakt lens uygulanan 25 kadın 17 erkek 42 hastanın 59 gözü çalışma kapsamına alındı. Hastalar 3 ile 12 yıl (ortalama 6,57±3,60) takip edildi. İlk muayenede yaş ortalaması 25,88±9,10; K1 değeri ortalaması 6,49±0,40 mm, K2 değeri ortalaması 5,91±0,40 mm. idi. Gözlük ve kontakt lens ile ortalama görme keskinlikleri 0,26±0,10 (0,63±0,20 logMAR) ve 0,66±0,20 (0,20±0.10 logMAR) bulundu. Görme keskinlikleri arasındaki fark istatistiksel olarak anlamlıydı(p=0,0001). Son muayenede SGG kontakt lens ile ortalama görme keskinliği 0,68±0,20 (0,19±0,10 logMAR) idi. İlk ve son muayenelerde kontakt lens ile alınan görme keskinlikleri arasında istatistiksel olarak anlamlı bir fark yoktu (p=0,32). Uzun takip süresi sonunda 17 gözde apikal skar gelişti. Sadece bir hastanın 2 gözüne 6 yıl SGG kontakt lens kullanımından sonra keratoplasti gerekti. Tar t›fl ma: İleri keratokonusu olan gözlerde SGG kontakt lensler, keratoplasti öncesi mutlaka düşünülmelidir. (Turk J Ophthalmol 2012; 42: 202-6) Anah tar Ke li me ler: Keratokonus, kontakt lens Sum maryPur po se: To evaluate the long-term results of rigid gas permeable (RGP) contact lenses in severe keratoconic eyes. Ma te ri al and Met hod: Severe keratoconic eyes with RGP contact lenses were evaluated retrospectively. Re sults: Long-term follow-up results of RGP contact lenses applied to 59 eyes of 42 patients (25 women, 17 men) with a diagnosis of severe keratoconus were analyzed. Follow-up period was 3 to 12 years (mean: 6.57±3.60). The mean age at first exam was 25.88±9.10 years, the mean corneal curve K1 was 6.49±0.40 mm and K2 was 5.91±0.40 mm. Mean visual acuities with spectacles and contact lenses were 0.26±0.10 lines (0.63±0.20 logMAR) and 0.66±0.20 lines (0.20±0.10 logMAR), respectively. The difference between both visual acuities was statistically significant (p=0.0001). At the last visit, the mean visual acuity with RGP contact lenses was 0.68±0.20 lines (0.19±0.10 logMAR). There was no statistically significant difference in visual acuity between first and last examinations with contact lenses (p=0.32). During the long-term follow-up period, apical scarring developed in 17 eyes. Only the 2 eyes of one patient needed penetrating keratoplasty after 6 years of RGP contact lens use. Dis cus si on: Use of RGP contact lenses should be considered before penetrating keratoplasty in cases of severe keratoconus. (Turk J Ophthalmol 2012; 42: 202-6)

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Retrospective Analysis of Vision Correction and Lens Tolerance in Keratoconus Patients Prescribed a Contact Lens With Dual Aspherical Curves

Abstract: Fitting of an Aphex KC lens improved visual acuity and increased lens wear time in keratoconus patients who were intolerant of a spherical RGP contact lens. Aphex KC thus provides a viable alternative for management of such patients.

Cited by 6 publications

References 32 publications

Bevel toric multicurve rigid gas-permeable lens for keratoconus

Bevel toric multicurve rigid gas-permeable lens for keratoconus

Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

İleri Keratokonuslu Olgularda Kontakt Lens Uygulaması: Uzun Süreli Takip Sonuçlarımız

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