Visual Performance and Optical Quality of Standardized Asymmetric Soft Contact Lenses in Patients With Keratoconus
| Autor: | Takashi Fujikado, Mutsumi Fuchihata, Kohji Nishida, Shizuka Koh, Naoyuki Maeda, Asaki Suzaki |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Adult
Male medicine.medical_specialty Keratoconus Corneal Wavefront Aberration Visual acuity genetic structures Visual Acuity Coma (optics) Refraction Ocular Cornea Young Adult 03 medical and health sciences 0302 clinical medicine Ophthalmology Aberrometry Humans Medicine Dioptre medicine.diagnostic_test business.industry Corneal Topography Middle Aged Contact Lenses Hydrophilic medicine.disease Corneal topography eye diseases Contact lens Eyeglasses medicine.anatomical_structure 030221 ophthalmology & optometry Female sense organs medicine.symptom business 030217 neurology & neurosurgery |
| Zdroj: | Investigative Opthalmology & Visual Science. 58:2899 |
| ISSN: | 1552-5783 |
| Popis: | Purpose To evaluate the visual performance and optical quality of a standardized asymmetric soft contact lens (SCL) used for correction of higher-order aberrations (HOAs) in eyes with keratoconus. Methods We included 30 eyes (26 patients) with keratoconus (average K: 45.7 ± 2.3 diopters [D]). The patients were subjected to corneal tomography, aberrometry, measurements of manifest refraction and visual acuity (VA), and visual analog scale (VAS) assessments. The study lenses were made using a molding method and consisted of six standardized types, in which an asymmetric power distribution of approximately 2 to 12 D (2-D step) was used to correct HOAs. The lens type suitable for each eye was selected based on the corneal tomography and aberrometry data. The on-eye performance of the lens was evaluated using aberrometry (4-mm pupil), over refraction, VA, and VAS. Results The standardized asymmetric SCL improved the best spectacle-corrected VA from -0.07 ± 0.09 to -0.11 ± 0.08 logMAR (P < 0.05) and the mean VAS score from 66.2 ± 21.8 to 75.4 ± 20.5 (P < 0.05). Vertical coma decreased significantly (-0.50 ± 0.36 μm without SCL; -0.36 ± 0.34 μm with SCL; P < 0.01). In subgroup analysis, subjects in the high VAS group (score ≥ 75) accounted for 70% of all subjects, and this was the group in which the vertical coma decreased significantly from the level without the lens. Conclusions A standardized asymmetric SCL can reduce HOAs and improve vision quality when compared with spectacles in patients with keratoconus who wear rigid gas-permeable lenses. |
| Databáze: | OpenAIRE |
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