Mekonnen, Yalemtsehay (Professor)Baye, Melese2022-02-222023-11-092022-02-222023-11-092021-07-10http://etd.aau.edu.et/handle/123456789/30281The visual system, in the human eye receives physical stimuli in the form of light and sends these stimuli as electrical signals to the brain, which interprets them as images. The complex color perceptions, human eye which are initiated by rods and cones in the retina and completed by impulse integration in the brain. The color blindness is inability of identifying colors and its prevalence varies between populations. The aim of the present study was to determine frequency of color vision deficiency among students of Andode Secondary School in Bole sub- city of Addis Ababa, Ethiopia. The study was conducted from March to May 2021. 948 students from grade 9, 10, 11, and12 participated in the study. Among these, 568 were females and 380 were males and their ages range from 15 to 23 years. Students who have volunteered and a written consent from their parents or guardians were included in the study. The test of color vision was used Ishihara 24 plates and subjects were asked to sit in a room with sufficient light and read the figures/symbols on the plates from a computer screen placed 75 cm away from the subject. The data were manually arranged and frequencies were calculated. Among the 948 students tested, 26(2.74%) have color vision defect, and these included 19(2%) males and 7 (0.74%) females . These 19 males with color blindness include, 2 (0.21%) achromatopsia, 12 (1.27%) deutan, 4(0.42%) protan and1(0.11%) unclassified(combined form). Female colorblind includes achromatopsia 2(0.21%), deutan 3(0.32%), protan 1(0.11%) and 1(0.11%) unclassified. The plate number 16and 17 Students can read are grouped under unclassified different from what red-green colorblind students read. The prevalence of color blindness was observed higher in males than in females. Teaching institutions screening students is recommended for color vision deficiency, so that they can provide the necessary assistance to such students.enColor Vision DeficiencyIshihara Test PlatesMonochromaticDichromateTrichromateProtanDeutan and TritanThesis