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Questions and Answers
The eye is the organ of ___.
False
The retina converts light into ___ impulses using specialized nerve endings.
False
The eyeball is about ___ mm in diameter.
False
The cornea is ___ and avascular.
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The sclera is the ___ opaque tough coat of the eyeball.
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The iris forms the colored part of the ___.
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The middle layer of the eyeball is called the ___ tract.
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The uveal tract is anatomically divided into iris, ciliary body, and ___.
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The ___ controls the amount of light entering the eye.
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The cornea admits ___ into the eye.
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The extraocular muscles allow the eye to move freely in ___ directions.
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The optic nerve conveys electric impulses to the ___.
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The sphincter pupillae is supplied by the parasympathetic system.
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The dilator pupillae is supplied by the parasympathetic system.
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The ciliary body secretes aqueous humor to control the intraocular pressure.
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The choroid is responsible for converting light rays into electric impulses.
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The macula lutea is responsible for night vision.
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The optic disc is insensitive to light and is known as the 'blind spot'.
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The conjunctiva lines the posterior surface of each eyelid and then reflects back to cover the eyeball.
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The levator palpebrae superioris muscle closes the eyelid.
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The lacrimal gland is part of the secretory part of the lacrimal apparatus.
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The orbit has 3 walls: roof, medial wall, and lateral wall.
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All extraocular muscles are supplied by the oculomotor nerve.
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Orbital cellulitis can be provoked by inflammation of the maxillary sinus in connection with dental infections.
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Iridocyclitis is characterized by symptoms of pain, photophobia, headache and blurring of vision.
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Primary glaucoma can present with a sudden acute rise in intraocular pressure within 1-2 hours.
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Retinal detachment is common in low myopia.
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Cataract can be caused by prenatal infections such as rubella or toxoplasma.
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Orbital fractures are commonly caused by sports injuries.
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Myopia is a condition where parallel rays focus behind the retina.
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Optic neuritis is characterized by pain with ocular movements.
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Glaucoma is an increase in the intraocular pressure more than the normal limits (10-21 mmHg).
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Proptosis (exophthalmos) may be caused by orbital tumors invading the orbit.
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Iridocyclitis can be caused by corneal ulcers or perforating corneal wounds.
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Cycloplegic eye drops are used to relax ciliary muscles and ciliary spasm in the treatment of iridocyclitis.
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Squint (strabismus) can be classified as comitant or non-comitant.
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