| What are the different Parts of an Eye? | -Cornea: Simply Bends or Refracts the Light into the Eye]
-Iris: Can control how much light comes into the Pupil [Hole in Middle]
-Lens: Same job has as the Cornea, excepts it also Focuses the Light for the Cornea
-Ciliary Body: This has Ciliary Muscles which are linked with the Suspensory Ligaments. These 2 pair up to be able to Alter the Shape of the Lens
-Retina: This is the Light Sensitive Part. Full of Rods and Cones which are Receptors which detects light.
-Rods: Better in Dim Light, but struggles with Colour
-Cones: Better with Different Colours but cant deal with Dim Light
-Optical Never: Takes the Impulses from the Receptors to the Brain |
| Are the Lens elastic, or not? What does that mean | The Lens are elastic meaning it can Focus the Light via the Shape of the Lens |
| What happens in the Eye, when viewing Distant Objects? | 1) Ciliary Muslces Relaxes, but the Suspensory Ligaments pull tightly which leads on to...
2) The Lens becomes into a Less Rounded Shape. This means that the Light is Refracted Less |
| What happens when you look at Close Objects in terms of the Eye | -Ciliary Muscles here Contracts, and the Susponsory Ligaments Slackens [They are both Inverse.] This leads to...
-Lens becoming more Rounded, the Light is Refracted More |
| What's the problem with Long-sighted People? Why? | -Long-sighted people can not really Focus on Near Objects
-Can happen when the Lens aren't in the Correct Shape, which leads to the Wrong enough of Light being Refracted. [Usually less] Can also be that the whole Eyeball is too short
-This leads to the Near object being Focused Behind the Retina, which isn't ideal
-Glasses, or Contact Lens that is CONVEX can Correct it |
| What's the Problem with Short-Sighted People? Why? | -Short Sighted People can Not Focus on Far Objects
-Happens when the Lens is in the Wrong Shape, and Bends the Light Too much, or the Eyeball is too Long
-Glasses, or CONCAVE Lens can Correct it
-Alternative to Glasses or Contact Lens is Corneal Laser Surgery |
| What is the Problem with Colour Blind People? Why? | -Colour Blind people can't tell the Difference between Certain Colour
-Common ones are Red/Green. This happens because the Red or Green Cones in the Retina aren't Functional
-This can not be Cured, but Tinted Lens can help for better Colour Vision. |
| How does the Eye Respond to Dim Light? | -Radical Muscles Contracts [Found in the Iris]
-Circular Muscles Relaxes [Found in the Iris
-Dilated Pupil = More Light enters In. |
| How does the Eye respond to Bright Light? | -Radical Muscles Relaxes [Found in the Iris]
-Circular Muscles Contracts [Found in the Iris]
-Contracted Pupil = Less Light comes in |
