a blind spot in the central vision of one or both eyes, increased sensitivity to light, a headache, distorted vision, such as a straight line looking bent, and colors looking differently than normal.

Psychologist Paul Ekman has distinguished between smiles that represent genuine happiness (“Duchenne” smiles), and fake smiles that might be used to feign happiness, or cover some other emotion.

Here's what you may see if you have one of these three eye conditions. When you have cataracts, you may notice symptoms that come on gradually. The world may look blurred or hazy. Colors could ...