Test-types for the determinination [i.e. determination] of the acuteness of vision / by H. Snellen.

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Test-types for the determinination [i.e. determination] of the acuteness of vision / by H. Snellen. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.