One of the mysteries of the English language finally explained.
Denoting glasses of which each lens is a single optical element; not bifocal.
- ‘This International Standard specifies the minimum requirements for complete single-vision ready-to-wear near-vision spectacles.’
- ‘This option entails wearing a bifocal or multifocal contact lens in one eye and a single-vision lens in the other eye.’
- ‘A series of single-vision ophthalmic lenses for use in the correction of vision for myopia, hypermetropia, or astigmatism is described.’
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