TY  - RPRT
TI  - Progressive addition and variable focus lenses: a review.
AU  - C M Sullivan
AU  - C W Fowler
PY  - 1988
DO  - 10.1111/j.1475-1313.1988.tb01177.x
UR  - https://pubmed.ncbi.nlm.nih.gov/3075730/
ID  - 3075730
ER  -