TY  - GEN
AU  - Krefman,R A
TI  - Working distance comparison of plus lenses and reading telescopes
SN  - 0093-7002
PY  - 1981///0224
KW  - Eyeglasses
KW  - standards
KW  - Humans
KW  - Lenses
KW  - Mathematics
KW  - Optics and Photonics
KW  - Refractive Errors
KW  - therapy
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1097/00006324-198011000-00009
ER  -