Asthenopia
The Optical Dictionary · 1904 · p. 2
Weak sight due to accommodative, muscular, or retinal causes.
Bu kavram başka kaynaklarda da geçiyor
Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
The American Illustrated Medical Dictionary (1913)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
Merck's 1899 Manual of The Materia Medica (1899)
The Student's Medical Dictionary (1896)
An Illustrated Encyclopaedic Medical Dictionary (1891)
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