References
- Gnadt G R, Amos JF. Dichromacy and its effect on a young male. J Am Optom Assoc 1992; 63: 475–80
- Pokorny J, Smith V C, Verriest G. Congenital color defects. Congenital and acquired color vision defects, J Pokorny, VC Smith, G Verriest, AJLG Pinckers. Grune and Stratton, New York 1979; 183–241
- Thompson MA. Color vision screening in Prince George's county. The Sight-Saving Rev 1962; 32: 216–7
- Shearron GF. Color vision deficiency in primary school children. The Sight-Saving Rev 1965; 35: 148–51
- Mäntyjärvi M. Velhagen Pflügertrident pseudoisochromatic plates in screening congenital red-green vision defects. Graefe's Arch Clin Exp Ophthalmol 1991; 229: 145–6
- Swanson W H, Everett M. Color vision screening of young children. J Ophthalm Nurs Tech 1992; 11: 164–71
- Stager D R, Everett M, Swanson WH. The importance of controlled illumination in color vision testing in a pediatric ophthalmology clinical practice. J Pediat Ophthalmol Strabismus 1993; 30: 39–42
- Dwyer JI. Colour vision defects in children with learning difficulties. Clin Exper Optom 1991; 74: 30–8
- Kalamus H, Amir A, Levine O, Barak E, Goldschmidt E. The frequency of inherited defects of colour vision in some Israeli populations. Ann Hum Genet 1961; 25: 51–5
- Adam A, Doron D, Modan R. Frequencies of protan and deutan alleles in some Israeli communities and a note on the selection-relaxation hypothesis. Am J Phys Anthropol 1967; 26: 297–305
- Voke J, Voke PR. Congenital dyschro-matopsias among Saudi Arabians. Saudi Med J 1980; 1: 209–14
- Perrine R P, Pembrey M E, Perrine S, Shoup F. Natural history of sickle-cell anemia in Saudi Arabs. Ann Int Med 1978; 88: 1–6
- El-Hazimi M AF. Aspects of the sickle- cell gene in Saudi Arabia. Proc Int Conf Sickle-cell Disease, Washington DC 1976
- Gelpi A T, King MC. Screening for abnormal haemoglobins in the Middle East: New data on haemoglobin C in Saudi Arabia. Acta Haematol 1976; 56: 334–7
- Lwanga S K, Lemeshow S. Sample size determination in health studies. A practical manual. WHO, Geneva 1991; 1–2
- Dain S J, Honson VJ. Selection of an optimal light source for the FM-100 hue test. Doc Ophthalmol Proc Ser 1989; 52: 425–32
- Atchison D A, Bowman K J, Vingrys AJ. Quantitative scoring methods for D15 panel tests in the diagnosis of congenital color vision deficiencies. Optom Vis Sci 1991; 68: 41–8
- Littlewood R, Hyde F. Screening for congenital colour vision defects. A comparison between the Ohkuma and Ishihara plates. Aust NZ J Ophthalmol 1993; 21: 31–5
- Grosvenor T. The incidence of red-green color deficiency in New Zealand's Maoris and 'Islanders'. Am J Optom Arch Am Acad Optom 1970; 6: 445–50
- Malaspina P, Ciminelli B M, Pelosi E, Santolamazza P, Modiano G, Santillo C, et al. Colour blindness distribution in the male population of Rome. Hum Hered 1986; 36: 263–5
- Kim H B, Lee S Y, Choe J K, Lee J H, Ahn BH. The incidence of congenital color deficiency among Koreans. J Korean Med Sci 1989; 4: 117–20
- Calderon R, Rebato E. Incidence of red-green colour blindness in the Basque population. Anthropol Anz 1990; 48: 145–8
- Zein ZA. Gene frequency and type of colour blindness in Ethiopians. Ethiop Med J 1990; 28: 73–5
- Birch J. A practical guide for colour-vision examination: report of the standardization committee of the international research group on colour- vision deficiencies. Ophthalm Physiol Opt 1985; 5: 265–85