The sag: A forgotten parameter in need of resurrection?
African Vision and Eye Health
| Field | Value | |
| Title | The sag: A forgotten parameter in need of resurrection? | |
| Creator | Gillan, Wayne D.H. | |
| Description | The advent of large-diameter rigid contact lenses (semi-scleral lenses) has necessitated renewed understanding of the concept of ‘the sag’ of a contact lens and/or cornea. This article reviews the concept of ‘the sag’ and how to calculate the sag for spherical and aspherical surfaces. Reviews of empirical studies investigating the sag of the eye are presented. Data for normal and keratoconic corneas for sags as measured with an Oculus Keratograph are also included. How to include empirical measurements obtained in practice, in the determination of a first-trial semi-scleral lens, is suggested. | |
| Publisher | AOSIS | |
| Date | 2016-09-16 | |
| Identifier | 10.4102/aveh.v75i1.352 | |
| Source | African Vision and Eye Health; Vol 75, No 1 (2016); 4 pages 2410-1516 2413-3183 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://avehjournal.org/index.php/aveh/article/view/352/596
https://avehjournal.org/index.php/aveh/article/view/352/597
https://avehjournal.org/index.php/aveh/article/view/352/598
https://avehjournal.org/index.php/aveh/article/view/352/591
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