TY  - JOUR
PY  - 1947//
TI  - Effect of quality of illumination and distance of observation upon performance in the Ishihara test
JO  - American journal of optometry and archives of American Academy of Optometry
A1  - Volk, D.
A1  - Fry, G. A.
SP  - 99
EP  - 122
VL  - 24
IS  - 3
N2  - <p>[Abstract unavailable]</p> <p>Language: en</p>
LA  - en
SN  - 0002-9408
UR  - http://dx.doi.org/
ID  - ref1
ER  -