1. National Assistance Act 1948, chapter 29, section 64,1948
2. A simple grating test for contrast sensitivity: preliminary results indicate value in screening for glaucoma;Arden, G.B.; Jacobson, J.J.;Invest Ophthalmol Visual Sci,1978
3. Abnormalities of central contrast sensitivity in glaucoma;Am J Ophthalmol,1979
4. A forced-choice test improves clinical contrast sensitivity testing;Vaegan, Halliday B.L.;BrJ Ophthalmol,1982
5. Vision through cataracts;Hess, R.; Woo, G.;Invest Ophthalmol Visual Sci,1978