TY  - GEN
AU  - Harvey,P A
TI  - Demonstrating astigmatism
SN  - 0950-222X
PY  - 1997///0410
KW  - Astigmatism
KW  - Humans
KW  - Ophthalmology
KW  - education
N1  - Publication Type: Letter
UR  - https://doi.org/10.1038/eye.1996.175
ER  -