TY  - BOOK
AU  - Duke - Elder,Stewart
TI  - The practice of refraction
U1  - 617.755 
PY  - 1963///
CY  - London
PB  - J and A Churchill
KW  - Eye
KW  - Accomodation and refraction
KW  - Astigmatism
KW  - Refractive errors
KW  - Myopia
N1  - Includes index
ER  -