Up to Date in OphthalmologyBr Med J 1973; 3 doi: https://doi.org/10.1136/bmj.3.5882.702-a (Published 29 September 1973) Cite this as: Br Med J 1973;3:702
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial