Radiation dose to the lens of the eye during computerised tomography examinations of the orbit, the pituitary fossa and the brain on a General Electric 9800 Quick C.T. scanner.

A phantom simulating the lens of the eye has been used during estimation of the radiation dose to the lens of the eye during C.T. scanning of the orbit, pituitary fossa and brain. Routine scanning will deliver a dose to the lens which is many times less than the threshold for cataracts. However the potential exists to use techniques which will increase the dose substantially. Repeat examinations of this sort could theoretically exceed the threshold dose required to induce cataracts in the lens.