Keratoconus

Hoy, Lachlan

doi:10.1016/b978-0-7020-7168-3.00020-9

Cited by 1 publication

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References 65 publications

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“…e UltraHealth contact lens has a diameter of 14.5 mm, and consists of a rigid gas permeable center (petrafocon A; oxygen permeability 130 Dk) and silicone-hydrogel skirt (hem-larafilcon A; oxygen permeability, measured as a function of diffusivity (D), solubility (k), and lens thickness (t): 84 Dk/t). e central 6.5 mm reverse geometry optic zone moves to a steeper reverse geometry lift curve that enables the rigid center to vault the central cornea [26]. e lens is available in powers −20.0 to +10.0 dioptre (D), with a vault of 50 to 550 μm in 50 μm steps and four skirt curves.…”

Section: Methodsmentioning

confidence: 99%

Results of the Pinhole Test Correlate with Hybrid Contact Lens Visual Acuity in Patients with Visual Impairment due to Corneal Diseases

Kanclerz

2022

Journal of Ophthalmology

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Introduction. Trial rigid lens fitting is considered the best approach to determine whether the correction of residual defocus and irregular astigmatism might improve the visual acuity in patients with corneal disorders including keratoconus. This study aimed to analyze the correlation between hybrid lenses and pinhole visual acuity (VA). Methods. Patients undergoing hybrid contact lens fitting at the Hygeia Clinic, Poland, were included. The VA of each patient was assessed as decimal Snellen fractions under the following conditions: (i) uncorrected VA, (ii) VA with spherocylindrical correction (i.e., corrected distance VA), (iii) VA with a single 1.2 mm pinhole occluder, and (iv) VA with the best-fitted hybrid contact lens. Pearson’s correlation coefficient r was used to assess correlations among variables. Results. This study involved 29 eyes of 19 patients, mainly with advanced keratoconus. The uncorrected VA was 0.11 ± 0.10. The pinhole test provided significantly improved VA over corrected distance VA (0.51 ± 0.29 vs. 0.31 ± 0.20, respectively; p < 0.0001 ). Similarly, the fitted hybrid contact lenses provided improved VA over corrected distance VA (0.66 ± 0.26 vs. 0.31 ± 0.20, respectively; p < 0.0001 ). The pinhole VA was strongly correlated with the hybrid contact lens VA (r = 0.8135; 95% CI: 0.61–0.92; p < 0.0001 ). The improvement in the pinhole test over corrected distance VA was moderately correlated with the improvement with the fitted lens over corrected distance VA (r = 0.6269; 95% confidence interval (CI): 0.32–0.80; p = 0.0005 ). Conclusions. A significant improvement in VA with the pinhole test is a simple predictor of general improvement with hybrid contact lenses. The pinhole test should be used in patients with corneal diseases such as keratoconus to determine whether optical aberrations associated with the disease cause their visual impairment.

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Section: Methodsmentioning

confidence: 99%

Results of the Pinhole Test Correlate with Hybrid Contact Lens Visual Acuity in Patients with Visual Impairment due to Corneal Diseases

Kanclerz

2022

Journal of Ophthalmology

View full text Add to dashboard Cite

show abstract

Keratoconus

Cited by 1 publication

References 65 publications

Results of the Pinhole Test Correlate with Hybrid Contact Lens Visual Acuity in Patients with Visual Impairment due to Corneal Diseases

Results of the Pinhole Test Correlate with Hybrid Contact Lens Visual Acuity in Patients with Visual Impairment due to Corneal Diseases

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