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OcularA&P #4 Midterm
Terms & Defs Ocular A&P: Muscle, Cornea, Sclera, Lens, Uvea, P&A Chambers
| Term | Definition |
|---|---|
| Name the muscle that closes the lids. | Orbicularis Oculi |
| The vertical dimensions of the palpebral fissure (area between the open eyelids) are approximately... | 8-11mm |
| Replacement lashes grow to full size in about | 10 weeks |
| Gray line runs between the ______ and the _______. | cilia and the meibomian openings |
| The orbicularis oculi muscle is supplied by the ______ cranial nerve for motor function and the _____ cranial nerve for sensation. | VII CN (Facial) - V CN (trigeminal) |
| The main muscle for raising the lid is the _______________________ and it's motor supply is the _____ cranial nerve. | Levator palpebral superior - III CN (Oculomotor) |
| Which lid muscle is supplied by sympathetic innervation? | Superior tarsal muscle of Mueller |
| The eyelids are innervated for sensation by the __________ cranial nerve. | V CN (Trigeminal) |
| With the rule astigmatism is steeper at __________ axis? | Vertical |
| Define Irregular Astigmatism | Rays of light come to focus at different locations. Are not 90 degrees to each other. *Side Note: Irregular Astig. is an irregular curvature of the cornea and when the curvature of the cornea varies in different parts of the same meridian. |
| You automatically measure the entire surface of the cornea with? | Corneal topographer |
| Bowman's membrane will scar when damaged? True or False | True |
| Normal corneal refractive power is ____D | 43.50 |
| Normal total refractive power of the eye is ____D? | 60-65 |
| Corneal thickness is measured with a | pachymeter |
| The cornea accounts for _______D of the refractive power of the eye. | 43-48 |
| Separates anterior from posterior chamber | Iris |
| Aqueous produced here | Pars plicata |
| Aqueous initially leaves a.c. (anterior chamber) through | Trabecular meshwork |
| AC angle | Between iris and cornea |
| Ciliary muscles attach here | Scleral spur |
| Device to view ac angle | Gonioscope |
| Zonules arise here | Pars Planae |
| Normal intraocular pressure | 10-20mm |
| Device to measure IOP | Tonometer |
| Ora Serrata | Demarcates (marks the) end of the pars planae, strongest vitreous attachment |
| Optic disc and cup | Posterior attachment of vitreous base |
| Syneresis of vitreous | Liquefaction of vitreous |
| Photopsia | Flashes of light from within eye Associated with vitreous traction |
| Asteroid hyalosis | Normal condition Calcium crystals in vitreous |
| Vitritis | Inflammation of vitreous |
| Vitreous face | Just behind lens of eye |
| Between trabecular meshwork and aqueous veins | Schlemm’s canal |
| Device to measure corneal thickness. | Pachymeter |
| Convergence always accompanies accommodation? True or False | True |
| Describe the accommodation process beginning with contraction of the ciliary muscle. | Ciliary muscles contract- allows the zonules to relax and stretch which allows the lens to thicken in the anterior-posterior plane. This increase in convexity increases power of the lens which causes the lens to focus the rays of light for near vision. |
| What happens when the ciliary muscles relax? | Tightening of the zonules, makes the lens become thinner in the anterior-posterior plane, which decreases the convexity of the lens for far vision. |
| What is the Accommodation table called? | Donder's Table |
| What relaxes the zonules and thickens the lens? | Contraction of the ciliary muscle |
| Ectopia Lentis | Dislocation or Subluxation |
| The adult nucleus is formed when? | Formed after birth before sexual maturation |
| When is the cortex formed? | After sexual maturation |
| What is Phacoemulsification? | Small incision cataract surgury |
| What is Pseudoexfoliation? | Depositions on the lens capsule |
| Zonules hold the lens in place. True or False | True |
| Thickest part of the iris | Iris Collarette |
| Depressions of the iris surface | Iris Crypts |
| Thinnest part of the iris | Iris Roots |
| Iris pigment epithelium is on the | posterior iris |
| Causes dilation of the pupil | Dialator muscles |
| The peripheral anterior synechia adheres the iris to the cornea. True or False | True |
| The posterior synechia adheres the _______ to the _______ | adheres the iris to the lens |
| Iritis is inflammation of the retina. True or False | False. It is the inflammation of the Iris |
| The persistent pupillary membrane is a remnant of the ___________ vessles. | Hyaloid |
| Red Reflex seen through the iris is | Transillumination |
| The Iridodialysis is the tear of the iris wall. True or False | False. It is the tear of the iris root. |
| The iris processes normally attach between the iris and the trabecular meshwork. True or False. | True |
| Anisocoria | Unequal pupils |
| The ciliary processes are located on the | Pars plicata |
| The flat part of the ciliary body | Pars plane |
| Aqueous is produced by the pars plicata. True or False | True |
| The peripheral end of the ciliary body and the beginning of the retina | Ora serrata |
| Normal fine contraction of the pupil is called | Hippus |
| Hole in the iris-usually by laser is called | Iridotomy |
| The ciliary muscle causes iris contractions. True or False. | False. The sphinster muscle causes iris contractions |
Created by:
Leequa
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