1. Test charts for distance preferred for low-vision;Fonda;Ann Ophthalmol,1987
2. New high-index Visolett magnifier;Fonda;Ann Ophthalmol,1992
3. Visolett® magnifier without and with bifocal;Fonda;Ophthalmology,1989
4. Diabetes aids and products for people with visual or physical impairment;Petzinger;Diabetes Educ,1992