1. Birch, J. Defective colour vision in diabetic retinopathy before and after laser photo-coagulation. Trans. Intern. Congress. Frontiers of Optometry. Vol. 1, pp. 13–21. Brit. College Ophthal. Opt., London (1984).
2. Birch, J. and Hamilton, A.M. Xenon arc and Argon laser photocoagulation in the treatment of diabetic disc neovascularisation Part 11. Effect on colour vision. Trans. Ophthalmol. Soc. U.K. 101:93–99 (1981).
3. Birch, J., Hamilton, A.M. and Gould, E.S. Colour vision in relation to the clinical features and extent of field loss in diabetic retinopathy. In: Colour Vision Deficiencies V, pp. 83–88. Adam Hilger, London (1980).