1. Evaluation of a photographic method for grading lens opacities for epidemiologic research;West;Invest Ophthalmol Vis Sci,1986
2. Use of photographic techniques to grade nuclear cataracts;West;Invest Ophthalmol Vis Sci,1988
3. West SK Newland HS Howard G et al. Evaluation of a photographic technique to grade cortical cataracts. (In preparation)
4. Measuring nominal scale agreement among many raters;Fleiss;Psycho1 Bull,1971