Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

A COBALT BLUE FILTER FOR OBSERVATION OF THE FIT OF CONTACT LENSES

A COBALT BLUE FILTER FOR OBSERVATION OF THE FIT OF CONTACT LENSES Abstract Pressure at the limbus or inside the limbus on the cornea itself is without doubt the reason for discomfort from contact lenses in at least 90 per cent of the patients who complain of inability to wear them except for short periods. Any contact lens which rests on any portion of the cornea cannot be worn for more than one hour and often for a much shorter time. Many contact lenses which have been judged as clearing the entire cornea have been proved, with a new method of observation, to rest on or inside the limbus. This is not surprising in view of the decided difficulty of observing the actual clearance as the edges of the cornea are approached. Part of this difficulty is due to the assumption that the corneal portion of the trial contact lens completely covers the cornea. Recent observations from castings of 200 eyes, reported References 1. Obrig, T. E.: Molded Contact Lenses , Arch. Ophth. 19:735 ( (May) ) 1938.Crossref 2. This lamp is manufactured by Fryxell and Hill, of New York. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

A COBALT BLUE FILTER FOR OBSERVATION OF THE FIT OF CONTACT LENSES

Archives of Ophthalmology , Volume 20 (4) – Oct 1, 1938

Loading next page...
 
/lp/american-medical-association/a-cobalt-blue-filter-for-observation-of-the-fit-of-contact-lenses-v7KJNbdKoa
Publisher
American Medical Association
Copyright
Copyright © 1938 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1938.00850220129010
Publisher site
See Article on Publisher Site

Abstract

Abstract Pressure at the limbus or inside the limbus on the cornea itself is without doubt the reason for discomfort from contact lenses in at least 90 per cent of the patients who complain of inability to wear them except for short periods. Any contact lens which rests on any portion of the cornea cannot be worn for more than one hour and often for a much shorter time. Many contact lenses which have been judged as clearing the entire cornea have been proved, with a new method of observation, to rest on or inside the limbus. This is not surprising in view of the decided difficulty of observing the actual clearance as the edges of the cornea are approached. Part of this difficulty is due to the assumption that the corneal portion of the trial contact lens completely covers the cornea. Recent observations from castings of 200 eyes, reported References 1. Obrig, T. E.: Molded Contact Lenses , Arch. Ophth. 19:735 ( (May) ) 1938.Crossref 2. This lamp is manufactured by Fryxell and Hill, of New York.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Oct 1, 1938

References