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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/17250
Title: The prevalence of Colorblindness among School Children in Akaki/kality Sub-City of Addis Ababa
???metadata.dc.contributor.*???: Dr. Kifle Dagne
Habte, Tsega
Keywords: Color Vision Deficiency;Ishihara’s Color Plates;Protan;Deutan;Tritan;Ishihara Color Plates
Issue Date: Aug-2017
Publisher: Addis Ababa University
Abstract: In the human visual system, the 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 human eye has complex color perceptions, which are initiated by cones in the retina and completed by impulse integration in the brain. Most people see the world in color, but there are people who do not perceive colors. These people may see colors differently than what most people perceive. The inability of identifying colors is known as color blindness and its prevalence varies between populations. The main aim of the present study was to determine the prevalence of color blindness among children in Beseka and Kality secondary schools. The study was conducted from March to May 2017.Random sampling method was used to estimate the sample size. Accordingly, 1081 students from grade 9 and 10 of the two schools participated in the study. Among these, 542 were females and 539 were males and their ages range from 14 to 20 years. All the school age children in the selected schools who have volunteered and a written consent from their parents or guardians were included in the study. Color vision was tested by using Ishihara 24 plates (Shinobu, 1972) and subjects were asked to seat 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 1081 students tested, 33(3.05%) have color vision defect, and these included 9 (0.83%) females and 24(2.22%) males. It was observed that the prevalence of color blindness is higher in males than in females. It was recommended that schools and other teaching institutions screen students for color vision deficiency, so that they can provide the necessary assistance to such students.
Description: A Thesis Submitted to the School of Graduate Studies of Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Biology.
URI: http://hdl.handle.net/123456789/17250
Appears in Collections:Thesis - Biology

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