TY  - RPRT
TI  - Subjective and objective visual acuity testing techniques.
AU  - S G Khan
AU  - K F Chen
AU  - M Frenkel
PY  - 1976
DO  - 10.1001/archopht.1976.03910040746009
UR  - https://pubmed.ncbi.nlm.nih.gov/999554/
ID  - 999554
ER  -