الفهرس 
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Abstract
The aim of this study was to detect the prevalence of color vision deficiency
among dental students in Alexandria, Egypt.
A sample size of 400 dental students from Alexandria was randomly
selected for the study. The sample size included 200 males and 200 females with
age ranges from 18 to 25 years. Non-Egyptian dental students were excluded, as
well as students younger than 18 years old, or older than 25 years old.
Pseudo-isochromatic plates [Ishihara test concise edition of fourteen plates]
were used in this study, the plates were made up of colored circles of varying
dimensions and chroma, against a background of other circles in which hue, in
addition to dimensions and chroma may vary. The test was fashioned in such style
that the design, through color contrast, may present one digit to the normal eye,
and somewhat another to the color-weak or color-deficient eye.
Upon obtaining the exempt status from the Committee of Ethics and
Protection of Human Subjects, the 400 dental students [participants] were
screened. An informed consent was obtained from all subjects. The screening was
carried under controlled lighting, and performed at almost the same time [from 11
a.m. to 3 p.m.]. Brief instructions were given to the participants containing
information on the Ishihara plates, and the importance of screening for color vision
deficiency. The participants were given 3 seconds to identify each plate placed in
front of them.
Summary and Conclusion
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The data collected and results were tabulated and statistically analyzed. The
scoring and analysis of their results were made easy using a key answer sheet that
denotes the usual response for persons with normal color vision and those made by
persons with different types of color vision deficiency.
Participants who were found to have color vision deficiency were given the
test again to confirm their answers. They were informed discretely about their
condition. They were given advice on how to deal with it in relation to dental
procedures which are affected by their condition.