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11 Cards in this Set
- Front
- Back
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Know anatomy of eye
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1. Eyelids-obicularis oculi muscle, tarsal plate, palpebral conjunctiva
2. Conjunctiva-palpebral and bulbar 3. Tear film-outer oil layer, middle aqueous layer, inner mucin layer. 4. Cornea, limbus, sclera a. Cornea-epithelium, stroma, Descemet’s membrane, endothelium 5. Iris and Ciliary Body (Anterior Uvea)-pupil, corpora nigra (granula iridica) 6. Choroid (Posterior Uvea)-tapetum 7. Lens 8. Vitreous 9. Retina-photoreceptor layer-primarily rods in horse, ganglion cell layer 10. Optic nerve |
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Sedation used for Ophthalmologic exam- Horses
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-Xylazine for minimally invasive
-Detomidine for longer sedation/analgesia -Xylazine + Torb= more time but "Torb 2 twitch" may cause mvmts! |
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Sedation used for minimally invasive ophth exam- Cows
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Xylazine
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Names for diff globe sizes
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Phthisis bulbi (shrunken)
Buphthalmia (enlarged) |
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Dazzle response
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Bright light shined = blink
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PLR
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Fxn of retina, optic nerve, midbrain, oculomotor n., iris, both pupils should constrict
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Eye- C & S
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Cultures taken from corneal, conjunctival or eyelid margin prior to adding anything to eyes
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Instruments needed for Dark room exam- ophtho.
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Transilluminator, direct ophthalmoscope w/ slit aperture, indirect lens, small hand held slit lamp, tonopen
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Tropicamide 1%
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Used to dilate pupil for exam of posterior structures, takes 20 mins, lasts 12 hrs
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Eyelid block- Horse
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Frontal n.- 3-4 ml of LA into supraorbital foramen (sensory to upper lid)
-Palpebral n. 3-4 ml of LA along lateral aspect of highest ptn of zygomatic arch midway b/t lateral canthus and base of ear blocks motor to orbicularis oculi -LA may be infused along orbital rim at the medial, lateral, and ventral aspects to block sensory innervation to these areas |
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Eyelid block- Cow
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-Palpebral n. blocked w/ 5-10ml LA SQ along zygomatic arch beginning at the level of the lateral canthus and continuing cd-ly for ~4cm
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