TY  - RPRT
TI  - Effect of defocus on visual acuity as measured by source and observer methods.
AU  - G Smith
AU  - R J Jacobs
AU  - C D Chan
PY  - 1989
DO  - 10.1097/00006324-198907000-00004
UR  - https://pubmed.ncbi.nlm.nih.gov/2771329/
ID  - 2771329
ER  -