You know that eczema can cause symptoms like itchy rashes, blisters, and dry, cracked skin but may not realize that this common skin condition can also cause lighter or darker patches to appear on ...

The most common types of color blindness, or color vision deficiency, are genetic. However, other types may develop due to injuries, eye diseases, health problems, and side effects of treatment.

Dr. Mark Lindsay was 5 years old when he first learned that tree trunks were brown. "Up until that point, I believed leaves and trunks were all green. Just lighter and darker shades," Mark said. Mark ...