eye Flashcards
(23 cards)
What is the weekly patient range for red eye treatment?
4 to 10 patients every week.
What percentage of patients with red eye treatment were diagnosed incorrectly?
64% of patients with red eye treatment were diagnosed incorrectly.
What percentage of misdiagnosed red eye cases had serious clinical consequences?
10% of these cases were serious clinical consequences.
What is the primary ability of the eye?
The ability to detect light energy.
What does the eye convert light energy into?
Nerve signals.
What percentage of sensory neurons are involved in vision?
70% of sensory neurons.
Which part of the brain is involved in visual processing?
Half of the cerebral cortex.
What are the accessory structures of the eye?
Eyebrow, eyelids, eyelashes, lacrimal caruncle.
What is conjunctiva?
A transparent mucous membrane that covers only the white of the eye, not the cornea.
What is the function of the lacrimal apparatus?
Keeps the surface of the eyeball moist and clean, reduces friction, removes debris, prevents bacterial infection, and provides nutrients and oxygen to the conjunctiva.
What are the three layers of the internal structures of the eye?
- The fibrous layer 2. The vascular layer 3. Inner layer (retina).
What does the fibrous layer consist of?
Cornea and sclera.
What is the function of the vascular layer?
Provides mechanical support and physical protection, serves attachment sites for muscles, and assists in the focusing process.
What does the inner layer (retina) do?
Provides a route for blood supply to the eye, regulates light entering the eye, secretes and reabsorbs aqueous humor, controls lens shape, and integrates visual information.
What is the function of the lens?
To focus the visual image on the photoreceptors.
What is the vitreous humor?
Transmits light, supports the lens, holds the neural layer, and contributes to intraocular pressure.
What is accommodation in the eye?
An automatic adjustment of the eye where the ciliary muscle relaxes for a flat lens shape or contracts for a rounded lens shape.
What are the two types of photoreceptors in the retina?
Rods and cones.
What is the function of rods?
They do not provide sharp images or color vision, are sensitive to dim light, and are peripheral vision receptors.
What is the function of cones?
Provide high-resolution color vision and are our vision receptors for bright lights.
Where are cones concentrated in the retina?
In the fovea.
What determines the colors we can see?
What wavelengths the eye (photoreceptors) can detect.
What are the major structures of the eye?
- Lids 2. Cornea 3. Iris 4. Lens 5. Suspensory ligament (zonules) 6. Ciliary body 7. Aqueous humor 8. Vitreous humor 9. Retina 10. Choroid 11. Sclera 12. Extra-ocular muscles 13. Lacrimal gland 14. Optic nerve 15. Visual pathways.
