1. Numerical one sided p values are reported for those calculations and the results were interpreted with the intention of looking for 'near regular patterns'.'5 Correlations were calculated using the Pearson correlation coefficient method. Statistical analysis was carried out on an IBM/PS2 using the SPSS/PC+ V2.0 Program,1988
2. Colour vision testing with a computer graphics system;Arden, G.B.; Gundiz, K.; Perry, S.;Clin Vis Sci,1988
3. Changes in colour contrast sensitivity associated with operating argon lasers;Guindiz, K.; Arden, G.B.;BrJ Ophthalmol,1989
4. A survey of color discrimination in German ophthalmologists;Arden, G.B.; Berninger, T.; Hogg, C.R.; Perry, S.;Ophthalmology,1991
5. Clinical and electrophysiological studies of human immunodeficiency virus-seropositive men without AIDS;Smith, T.; Jakobsen, J.; Gaub, J.; Helweg-Larsen, S.; Troiaborg, W.;Ann Neurol,1988