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OcularA&P #4 Midterm

Terms & Defs Ocular A&P: Muscle, Cornea, Sclera, Lens, Uvea, P&A Chambers

TermDefinition
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