Purpose: This study aimed to screen color vision deficiency in school children at Mansoura schools, Egypt. And to evaluate the state of awareness regarding their anomaly
Patients and methods: This was a descriptive cross sectional observational study included 1106 students aged from 10 to 15 years old underwent visual acuity examination by Landolt broken ring chart, contrast sensitivity examination by Pelli Robson contrast sensitivity chart and color vision examination by both Ishihara book and Farnsworth-Munsell D-15 hue test.
Results: This study showed that the prevalence of color vision deficiency in school children aged from 10 to 15 years old is 2% of the total students and it is more common an males (2.4%) than females (1.3%). We found that the most common type is equal deficiency of both red and green followed by protanomaly, deutranomaly and deuteranopia. We found no cases of tritanomaly or total color blindness. There is no clinically significant relationship between CVD and age group and also there is no clinically significant relationship between CVD and Contrast sensitivity. All students with CVD in our study were unaware of their color vision defect.
Conclusion: This study reveals that the occurrence of CVD among the students in Mansoura district was 2%, with males having a noticeably higher prevalence than females. The majority of the cases exhibited equal deficiency in both red and green, followed by a mild protan, and then an equal percentage of both mild and severe duetan forms.