1. Smiddy WE, Hamburg TR, Kracher GP . Therapeutic contact lenses. Ophthalmology 1990;97:291–5.
2. Liesegang TJ . Contact lens-related microbial keratitis. I. Epidemiology. Cornea 1997;16:125–31.
3. Tan DTH, Pullum KW, Buckley RJ . Medical applications of scleral contact lenses. A retrospective analysis of 343 cases. Cornea 1995;14:121–9.
4. Ezekiel D . Gas permeable haptic lenses. J Br Contact Lens Assoc 1983;6:158–61.
5. Ruben CM, Benjamin WJ . Scierai contact lenses: preliminary report on oxygen-permeable materials. Contact Lens 1985;13:5–10.