1. Grading scales for contact lens complications.;Efron;Ophthalmic Physiol Opt,1998
2. Validation of grading scales for contact lens complications.;Efron;Ophthalmic Physiol Opt,2001
3. Contact Lens Practice, 2nd ed.;Efron,2010
4. Confocal microscopy of the living eye.;Cavanagh;CLAO J,1990
5. Confocal microscopy of the normal human cornea.;Efron;Cont Lens Anterior Eye,2001