Light is converted into nerve impulses in the retina apex

Retina

The retina is the part of the eye which converts light into electrical impulses with its photoreceptor cells (rods and cones) to the brain. Vision is achieved when light enters the pupil, focused by the lens, and converted into signals in the retina.  

don't compare yourself to others, this is a big one because due to photoshop and surgery people have this unrealistic image of what they should look like in their head.

think about good qualities you have and jot them down so can go back when you're feeling down about yourself.

make sure you have good hygiene, bathing often, face routine, brushing teeth.

if you'd like to change something set a realistic goal! (;