What is the function of the Cornea in the eye?
Bends (refracts) light and protects the eye
The cornea provides about 70% of the eye’s focusing power.
What is the Aqueous Humor?
Clear, watery fluid in the anterior chamber
It nourishes the cornea/lens and maintains eye pressure.
What does the Iris do?
Controls light entry
The iris is the colored part around the pupil.
What is the Pupil?
Black hole in the iris that adjusts light amount
It dilates/contracts to control how much light enters the eye.
What is the role of the Crystalline Lens?
Changes shape to focus on near/far objects
This process is known as accommodation.
What do the Ciliary Muscle and Suspensory Ligaments do?
- Ciliary Muscle: Contracts to thicken lens for near focus
- Suspensory Ligaments: Hold lens in place
These structures work together to adjust the lens shape.
What is the Vitreous Humor?
Jelly-like fluid filling the posterior chamber
It keeps the eye’s shape and allows light to pass through.
What is the function of the Retina?
Converts light to electrical signals
The retina is light-sensitive and acts like camera film.
What does the Choroid do?
Supplies blood/nutrients to the eye
It is the vascular layer under the retina.
What is the Sclera?
Tough, white outer wall of the eye
It protects and maintains the shape of the eye.
What is the Optic Nerve?
Bundle of fibers carrying signals from retina to brain
It transmits visual information for processing.
What does the Conjunctiva do?
Keeps the eye moist
It is a thin membrane covering the sclera and inner eyelids.
What is the Macular Area?
Region around the fovea for central vision
It is crucial for sharp, detailed vision.
What are the Anterior and Posterior Chambers?
Fluid-filled spaces in the eye
They are located at the front and back of the eye.
In a normal (emmetropic) eye, light from distant objects focuses __________.
exactly on the retina
This means no correction is needed for clear vision.
What is the mnemonic for the Light Path through the eye?
Crazy Apes Love Very Rotten Carrots On Sundays
This stands for Cornea, Aqueous, Pupil, Lens, Vitreous, Retina, Choroid, Optic Nerve, Sclera.
True or False: In the normal (emmetropic) eye, light from distant objects focuses behind the retina.
FALSE
Light focuses exactly on the retina in a normal eye.
What is the fluid in the back of the eye and its main function?
Vitreous Humor; keeps the eye’s shape
It allows light to pass through to the retina.
If a patient says distant vision is clear, but they strain for reading, what’s happening with their lens?
The lens may not be accommodating properly for near vision
This could indicate a refractive error.
