According to the first doctor who failed his color vision test, there are many males that having color vision problem, but they are not colorblind as in not seeing all colors. They suffer from differentiating the green and brown color most time, some have problem identifying red as well but to a much lesser extent. There is no treatment for this hereditary condition which was born with, and only this optical shop is doing the corrective lenses for color vision. They only prescribe the FDA approved color vision lens, Chromagen. It’s 100% effective and 100% safe to be used. Price is RM 4000 a pair this year and Usj Optometrist did informed the cost normally increased nearly every year. My friend finds the lens really helpful and most importantly he gets his high pay dream job now.