Photographs of right eye of a diabetic patient During early stage with optic disc oedema with prominent blood vessels on the disc and many retinal haemorrhages

Eyes and Cameras Objectives What do you call a deer without eyes? -No idea What do you call a one-eyed dinosaur? - Douthinkhesaraus These jokes just get cornea and cornea! "A guy was in spescavers the other day....guess who he bumped into?? -Everyone!!“ 19 November 2018 Eyes and Cameras Objectives Be able to describe the structure of the eye and the camera and describe how they work. Fun facts about the eye The image at the retina is actually upside down from the actual image. Our brain figures this out for us and switches it around, or we would get really confused! The cornea is a clear layer at the front of the eye that helps protect it. We have a blind spot where the optical nerve connects to the retina. Tears help keep the eye clean, but scientist don't really understand why we cry when we are sad or upset. The average person blinks 15 times per minute. Around eight percent of men are color blind, but less than one percent of women.

OUTCOMES ALL MUST be able to label the structure of the eye and a camera. MOST SHOULD be able to describe what the parts of an eye and a camera do. SOME COULD be able to compare the differences between how a camera and an eye work.

Group Task You will be given a diagram of the eye and labels and descriptions You must try and match them up Go!

How’d you do – mark out of 18? Cornea: A clear surface that allows light through but protects the eye from dust and infection. About 2/3 of the focussing occurs here. Pupil: This is where light enters the eye. It gets larger in dim light and smaller in bright light. Iris: This changes size to make the pupil larger or smaller. Lens: This fine tunes the light to focus on the retina. It gets thicker to focus on near objects and flatter to focus on distant objects Retina: Has light sensitive cells that send electrical signals along to the optical nerve. Suspensory Ligament: Holds the lens in place. Ciliary Muscle: These pull on the lens to change its shape. Optic disc: The beginning of the optical nerve. There are no light sensitive cells here and so it causes a blind spot in vision. Optic Nerve: takes the electrical signal to the brain. The Eye How’d you do – mark out of 18?

Comparing an Eye and a Camera Use the information on page 146 and 147 to make a poster as a revision resource of the eye and a camera. It must include a description of what each part labelled does. On your poster create a table headed Similarities and Differences. Be prepared to present your work to a different group. Criteria Grade C: Must have a neat labelled diagram of an eye and a camera Grade B: Must describe what each label does Grade A: Has a table comparing the similarities and differences Grade A*: Can explain to others how an eye and a camera work clearly and describe the similarities and differences

Peer feedback You will now give feedback to another student based on the criteria. Give them a WWW/EBI comment. Grade C: Must have a neat labelled diagram of an eye and a camera Grade B: Must describe what each label does Grade A: Has a table comparing the similarities and differences Grade A*: Can explain to others how an eye and a camera work clearly and describe the similarities and differences

Dissection? Or group task again – looking for 18/18 this time!

Pupil retina Suspensory ligament Iris Optic nerve Lens cornea Ciliary muscle Optic disc