Daytime Edema Levels with Plus Powered Low and High Water Content Hydrogel Contact Lenses
| Autor: | D. La Hood |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Adult
medicine.medical_specialty genetic structures High water content law.invention Oxygen Consumption Corneal edema law Cornea Ophthalmology Edema medicine Humans Water content Chemistry Corneal Edema Contact Lenses Hydrophilic eye diseases Surgery Contact lens Lens (optics) medicine.anatomical_structure sense organs medicine.symptom Hypoxic stress Optometry |
| Zdroj: | Optometry and Vision Science. 68:877-880 |
| ISSN: | 1040-5488 |
| DOI: | 10.1097/00006324-199111000-00008 |
| Popis: | Eleven unadapted contact lens wearers wore a high (74%) water content hydrogel lens (Permaflex, CooperVision) of oxygen transmissibility Dk/Lav 14 x 10(-9) in one eye and a low (43%) water content hydrogel lens (Aquaflex Superthin) of Dk/Lav 4 x 10(-9) in the other eye under open-eye conditions for 8 h. After 8 h, average corneal edema for the lower water content lens was 7.9 +/- 2.6%, which was significantly more than that for the higher water content lens, 1.7 +/- 1.6%. Significantly fewer corneal striae and folds were also seen in the eyes wearing the higher water content lens. Subjective ratings of lens comfort were significantly better for the higher water content lens. Low water content positive power hydrogel lenses of the thicknesses used in this study place unacceptable hypoxic stress on the cornea and therefore should not be used for all-day wear. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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