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Ocular A&P #11 Final
Questions Ocular A&P: Physiological Optics, Vascular & Lymphatic System
| Question | Answer |
|---|---|
| What is the approximate power of the eye optical system? | 60d |
| What is the approximate power of the cornea? | 43.5d |
| What is the approximate power of the lens? | 16-20d |
| A too large pupil creates ____________ aberration. | Spherical |
| A convex lens causes _________________ of the image. | Magnification |
| What is the cause of presbyopia? | Age |
| What type of astigmatism cannot be corrected with glasses? | Irregular |
| 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. |
| Name the lower order aberrations. | Refractive errors (myopia, hyperopia, regular astigmatism) |
| With the rule astigmatism has the steepest meridian at ___________ meridian, _________degrees axis. | Superior, 90° |
| Stereopsis occurs at ___________ degree fusion. | Third |
| A concave lens bends lights towards the ______________ and corrects _____________. | Periphery / Myopia |
| What device is used manually to measure astigmatism? | Keratometer |
| What device is used automatically to map the surface of the cornea? | Corneal topography |
| What device is used to perform refractions? | Phoropter |
| What is the blood supply to the inner retina? | Central Retinal Artery |
| What is the blood supply to the outer retina? | Choriocapillaris |
| What is the blood supply to the choroid? | Ciliary Arteries |
| What is the main artery that supplies most of the blood to the eye and the adnexa? | Ophthalmic- a branch of the internal carotid |
| What drains the choroid? | Vortex Veins |
| What drains the retina? | Central Retinal Vein |
| All the blood from the eye and adnexa drain to here _______________________. | Cavernous sinus in the brain. |
| What is the blood supply to the fovea? | Choriocapillaris |
| What is produced by the lymph nodes? | Lymphocytes and monocytes |
| The medial lids and the lacrimal sac drain to the _________________. | Submandibular nodes |
| The lateral lids and the lacrimal gland drain to the ________________. | Preauricular nodes |
| What are the primary non-specific defense tools (first line of defense against injury)? | Tears, sweat, saliva, skin, corneal epithelium |
| How many vortex veins are there? | 4 to 6 |
| 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. |
| The cilioretinal artery is from the ________________. | Ciliary arteries |
| The external face and head are supplied by the _______________________. | External carodtid |
| What are the four signs of inflammation? | Heat, swelling, pain, redness. |
Created by:
Leequa
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