Visual test-types, test-characters, test-letters, and a uniform central test-object for measuring the acuity of vision
By: by A.E. Ewing. With 24 engraved plates. Special instructions for the use of visual test-types in schools and industrial establishments
Publisher: C.V. Mosby Co.
Published: 1926
Place of publication: St. Louis
Language: eng
Number of pages: 14
Subjects: Eye; Examination; Vision
Notes: Plates are unbound. 5 cm.; 36 cm.