TY  - RPRT
TI  - Letter: Classification of visual performance.
AU  - B E Spivey
AU  - A Colenbrander
PY  - 1976
DO  - 10.1001/archopht.1976.03910040135020
UR  - https://pubmed.ncbi.nlm.nih.gov/938299/
ID  - 938299
ER  -