Questions Ocular A&P: Physiological Optics, Vascular & Lymphatic System
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the approximate power of the eye optical system? | 60d
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| What is the approximate power of the cornea? | 43.5d
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| What is the approximate power of the lens? | 16-20d
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| A too large pupil creates ____________ aberration. | Spherical
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| A convex lens causes _________________ of the image. | Magnification
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| What is the cause of presbyopia? | Age
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| What type of astigmatism cannot be corrected with glasses? | Irregular
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| What are two visual problems with aphakia? | Jack in the box-midperipheral scotoma, 30% magnification with glasses. Thick heavy lenses. If only one eye has aphakia, creates too much anisometropia and anisekonia.
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| Name the lower order aberrations. | Refractive errors
(myopia,
hyperopia,
regular
astigmatism)
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| With the rule astigmatism has the steepest meridian at ___________ meridian, _________degrees axis. | Superior,
90°
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| Stereopsis occurs at ___________ degree fusion. | Third
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| A concave lens bends lights towards the ______________ and corrects _____________. | Periphery
/
Myopia
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| What device is used manually to measure astigmatism? | Keratometer
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| What device is used automatically to map the surface of the cornea? | Corneal topography
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| What device is used to perform refractions? | Phoropter
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| What is the blood supply to the inner retina? | Central Retinal Artery
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| What is the blood supply to the outer retina? | Choriocapillaris
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| What is the blood supply to the choroid? | Ciliary Arteries
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| What is the main artery that supplies most of the blood to the eye and the adnexa? | Ophthalmic- a branch of the internal carotid
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| What drains the choroid? | Vortex Veins
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| What drains the retina? | Central Retinal Vein
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| All the blood from the eye and adnexa drain to here _______________________. | Cavernous sinus in the brain.
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| What is the blood supply to the fovea? | Choriocapillaris
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| What is produced by the lymph nodes? | Lymphocytes and monocytes
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| The medial lids and the lacrimal sac drain to the _________________. | Submandibular nodes
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| The lateral lids and the lacrimal gland drain to the ________________. | Preauricular nodes
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| What are the primary non-specific defense tools (first line of defense against injury)? | Tears, sweat, saliva, skin, corneal epithelium
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| How many vortex veins are there? | 4 to 6
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| What is the function of the lymph system? | Collects lymph from vessels and tissues and transports it to nodes to filter out bacteria, etc, and to produce cells to fight infections.
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| The cilioretinal artery is from the ________________. | Ciliary arteries
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| The external face and head are supplied by the _______________________. | External carodtid
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| What are the four signs of inflammation? | Heat, swelling, pain, redness.
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