The Evolution and Structure of the Human Eye

What is the primary function of the human eye?

• To aid in digestion

• To detect light and process visual information

• To regulate body temperature

• To produce tears

What did Charles Darwin find absurd about the human eye?

• Its ability to detect light

• Its complexity and the idea that it evolved

• Its size

• Its color

What is the initial form of the eye in single-celled organisms like euglena?

• A pinhole

• An iris

• A lens

• A light spot

What evolutionary advantage does the cupped light spot in planaria provide?

• Better color vision

• Improved sense of light direction

• Increased speed

• Enhanced smell

What is the key step towards the eye as we know it?

• The creation of tear glands

• The formation of the sclera

• The evolution of a lens

• The development of the iris

What is the function of the iris in the human eye?

• To focus light on the retina

• To control the amount of light entering the eye

• To secrete a protective film

• To maintain the eye's structure

What causes the blind spot in the human eye?

• The presence of the iris

• The sclera's thickness

• The curvature of the lens

• The inverted retina

How do the eyes of cephalopods differ from human eyes?

• They have a reflective layer

• They have a front-facing retina

• They have a divided eye structure

• They lack a lens

What unique feature do the eyes of the four-eyed fish, Anableps, have?

• A reflective layer for night vision

• A divided structure for looking above and under water

• A front-facing retina

• A pinhole effect

What is the purpose of studying different eye structures today?

• To increase eye size

• To enhance night vision

• To design biomechanical implants for the vision impaired

• To improve color vision