Test-types for the determination of the acuteness of vision
By: by H. Snellen.
Edition: 4th ed.
Publisher: Williams and Norgate
Published: 1868
Place of publication: London
Language: eng
Number of pages: 22
Subjects: Vision -- Testing.
Notes: Includes bibliographical references.
Translation of: Probebuchstaben zur Bestimmung der Sehschärfe.