The sag: A forgotten parameter in need of resurrection?
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 emp...
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| Format: | Article |
| Language: | English |
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AOSIS
2016-09-01
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| Series: | African Vision and Eye Health |
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| Online Access: | https://avehjournal.org/index.php/aveh/article/view/352 |