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Our galleries are quietest on weekdays and weekend mornings. At busy times, particularly on Saturdays, you may need to queue for our temporary exhibitions.

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Ophthalmic lenses : dioptric formulae for combined cylindrical lenses, the prism-dioptry and other optical papers / by Charles F. Prentice.

The action and uses of prismatic combinations / by Archibald Percival.

The relation between the length of aphakic eyes and their appropriate correcting glasses / by Arch'd Stanley Percival.

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Active filters:

Ophthalmic lenses : dioptric formulae for combined cylindrical lenses, the prism-dioptry and other optical papers / by Charles F. Prentice.

The action and uses of prismatic combinations / by Archibald Percival.

The relation between the length of aphakic eyes and their appropriate correcting glasses / by Arch'd Stanley Percival.