The EyeSpecial Sense Organs

Three Layers of Tissue

1. the sclera

2. the choroids

3. the retina

PhotoreceptorsRods are responsible for detecting objects in dim light – black and white.

Cones are responsible for detecting objects in bright light – colors – red, green, and blue.

Vision

HyperopiaFarsightedness

Image shows up behind the retina – eye is too short

MyopiaNearsightedness

Image shows up in front of the retina – eye is too long

PresbyopiaOldsightedness

Lens looses its ability to focus on objects – can’t see objects up close