The Eye (2)

Question 1

Eye

Answer 1

Filters, focuses and converts light into electrical impulses that our brain can interpret.

Question 2

Abnormalities

Answer 2

Abnormalities in the shape of the Cornea, Lens, or other parts can cause distorted or blurred vision because light is distorted or partially blocked.

Question 3

Cornea

Answer 3

Allergies and Infections are common

Question 4

Iris and Pupil

Answer 4

Iris is a disk with a hole in the centre, the Pupil.

• Pigment in Iris gives colour
• Iris regulates light

Question 5

“Scotopic Vision”

Answer 5

Fully dark adapted or the Iris has adjusted to the amount of light needed to see.

Question 6

Lens and Ciliary Muscle

Answer 6

Lens focuses entering light. Lens shape changed by Ciliary muscle movement which changes focal length (focus).

• Lens filters out frequencies of light
• Lens yellows with age increasing absorption of the blue spectrum

Question 7

Aqueous and Vitreous Humor

Answer 7

Aqueous is a sac of fluid between the Iris/Lens and Cornea.

Vitreous is the sac of fluid between the Lens and Retina
- Both maintain eye shape for visual acuity

Question 8

Retina

Answer 8

The screen where light is projected at the back of the eye. Covered with specialized photoreceptor cells that convert light to electrical impulses for the brain.

Question 9

Optic Nerve

Answer 9

Connects Retinas photoreceptor cells to the brain.

Question 10

Rod Cells

Answer 10

Detect presence of light.

- Type of photoreceptor cell

Question 11

Cone Cells

Answer 11

Determine colour of light.
Types:
- Short (Blue/Violet)
- Medium (Green)
- Long (Red)
- Type of photoreceptor cell.

Question 12

Macula and Fovea

Answer 12

Macula is area of retina responsible for central vision.
- Contains both Rod and Cone Cells

Fovea is central of the Macula.
- High concentration of Cone Cells