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6y
yes, it's quite rare.. somewhere between 1 in 30000 to 1 in 50000. vision is more like different shades of gray and they differentiate those shades based on brightness.
yes, it's quite rare.. somewhere between 1 in 30000 to 1 in 50000. vision is more like different shades of gray and they differentiate those shades based on brightness.
RE: The science of Color Blindness and its Diagnosis