Hospital Corpsman Sickcall Screener's Handbook
BUMEDINST 6550:9A
Naval Hospital Great Lakes
1999
The Eye
Anatomy:
External Eye
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Eyelids Composed of skin, conjunctiva and muscle.
Function
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To distribute tears over the surface of the eye
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To talk about this To limit the amount of light entering it
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To protect it from foreign bodies.
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Conjunctiva: a thin membrane covering most of the anterior eye and tie inner surface of the eyelid in contact with the globe. Protects the eye from foreign bodies and drying out.
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Lacrimal gland: Located in the lateral superior eyelid produces tears that moisten the eye. Tears drain via the lacrimal sac into the nasal cavity.
Internal Eye: Made up of three separate coats or tunics. The outer fibrous layer is made up of the sclera posteriorly and the cornea anteriorly. The middle coat or choroid is made up of the choroid posteriorly and the cilliary body and iris anteriorly. The inner coat is the retina.
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The sclera appears as the white of the eye and forms the structural support for the eye.
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The cornea is a continuation of the sclera can sense pain and separates the aqueous humor of the anterior chamber from the external environment and transmits light through the lens to the retina.
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The iris is a circular muscle that gives eyes their color. The hole in the center of the iris is the pupil. The iris controls the amount of light going through the pupil by dilating and contracting.
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The lens is located right behind the iris. It is a transparent crystal that is very elastic. By stretching it the thickness changes allowing images from varying distances to be focused on the retina. Note: as people age the lens tends to dry and become less elastic causing people to have problems reading- having to hold a book two feet away to focus on the page (Presbyopia).
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The retina is the sensory nerve network of the eye changing light impulses to electrical impulses, which are sent via the optic nerve to the brain.
Physical exam:
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Test visual acuity Snellen chart at 20 feet is best screening method, "cover one eye and read the smallest line possible". Visual acuity is expressed as two number 20/30. The first number is the distance in feet from chart, the second the distance at which a normal eye can read the line of letters. Vision of 20/200 means that the patient can read print at 20 feet that a person with normal vision could read at 200 feet. You can test visual acuity with any available print.
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Inspection of eyelids, conjunctiva and sclera-
Observe eyelids for redness, swelling, and lesions. Inflammation of an eyelash follicle with a lump called a sty or hordeolum is usually caused by staph. Check the position of the upper lid it should cover a sty or hordelum is usually caused by staph. Check the position of the upper lid it should cover the top part of the iris only but not the pupil. Ptosis is present when the upper eyelid droops over the pupil
Check the conjunctiva and sclera for redness color or discharge. A yellow sclera indicates jaundice. Ask the patient to look up as you depress both lower lids with your thumb exposing the sclera and conjunctiva. A special exam is done if you suspect a foreign body eversion of the upper eyelid. Ask the patient to look down, pull downward and forward on the eyelashes. Place a "Q" tip 1 cm above the lid margin and push down on the upper lid everting it
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Pupils Inspect the size and equality of pupils.
Test the pupillary response to light shine light obliquely into each eye. Look for:
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Direct reaction (constriction of the same eye)
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The consensual reaction (pupillary contraction in the opposite eye).
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Extra ocular Eye Muscles:
Ask patient to watch your finger as you move it in six directions (think of a capital H) Watch for Nystagmus the involuntary rhythmic rapid movement of the eye.
Clinical Eye Problems:
Eye Lid Problems:
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Blepharitis the most common inflammation of the eyelids caused by seborrhea or bacteria (staph infection) frequently associated with conjunctivitis.
S: Burning irritation, itching and redness of the eyelid.
O: Scaly or granular matter clinging to the eyelashes with red-rimmed eyes, pruritus
A: Blepharitis
P: Remove scales with warm compresses and gentle scrubs.
Treated with Erythromycin Ophthalmic Ointment
(Ilotycin) apply to lids 2-4 x QD. Refer to MD/PA if not improved.
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Hordeolum (sty) and Chalazion.
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Horeolum is an acute lesion at the eyelid margins usually in the sebaceous glands caused by a staph infection. If a sty becomes chronic it may evolve into a chalazion, an enlargement of the meibomian gland due to a blockage of the duct. A hordeolum is painful, a chalazion is painless.
Hordeolum
S: Painful swelling of the eyelid, a "foreign body" sensation, no vision changes.
O: tender, swollen lesion along the lid margin with a small center of induration, and erythema. If seen later a yellowish spot indicating the localization of the infection into a small abscess, and /or purulent drainage may be seen.
A: Hordeolum (sty)
P: warm compresses three or four times a day for 10 15 minutes.
Erythromycin Ophthalmic Ointment
(Ilotycin) 3 or 4 times daily.
If systemic antibiotics are indicated because of cellulitis refer to MD/PA.
Chalazion
S: Hard, non-tender swelling of the eyelid possibly proceeded by sty.
O: Firm, cystic swelling of the eyelid, conjunctiva, may be red in the region of the chalazion.
A: Chalazion
P: Refer to MD/PA for referral to Ophthalmologist for excision.
Eye Inflammation Problems
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Conjunctivitis An inflammation of the conjunctiva, a mucous membrane that lines the inner portions of the eyelids (palpebral) and covering the anterior surface of the eyeball (bulbar or bulb), may be due to bacteria, viral, or allergic causes.
S: Sensation of burning, itching or foreign body with irritation, photophobia, tearing, and a discharge that may cause the eyelids to stick together.
O: Red, injected conjunctiva, clear cornea, pupils react normally. Discharges as follows:
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Bacterial profuse purulent exudate (true Pinkeye).
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Viral mucupurulent discharge (minimal amount) with profuse tearing.
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Allergic minimal mucoid watery discharge with severe itching
A: Conjunctivitis
P: Check and document visual acuity.
If indicated check for foreign body or corneal abrasion by staining eye with a Fluor Strip. Do not patch the eye!
Bacterial:
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Sodium sulfacetamide (sulamyd) ointment or solution. (Note: Solution needs refrigeration).
Solution: one-gtt q 4-6 hours into lower conjunctival sac.
Ointment: q.i.d. and at bedtime or HS
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Gentamicin (Garamycin) ophthalmic solution and ointment: instill one gtt q 4 hours or small amount ointment 2-3 x qd, or
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Erythromycin Ophthalmic Ointment
(Ilotycin) q.i.d.
Viral: No treatment, self-limiting lasting about 10 days. Usually treated with one of the bacterial medications to prevent bacterial infection.
Allergic: Antihistamine orally may help. (Dimetapp, CTM or Sudafed).
Vasocon-A, (for allergic conjunctivitis) one to two gtts 2-4 x qd.
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Iritis (acute Uveitis) An acute inflammation of the iris characterized by pain, photophobia and blurring of vision, a red eye without purulent discharge and a small pupil, -contracted (miosis); it is thought to be a hypersensitivity reaction to some other infection in the body probably bacterial or fungal. In this condition a dilation medication is used to prevent the adherence of the iris to the lens. In conjunctivitis vision is not blurred, pupillary responds normal, a discharge is present and there is no pain or photophobia.
S: Acute onset of pain, redness, photophobia and blurred vision.
O: Pupil is miotic (constricted) small and may be irregular. Decrease in visual acuity due to blurred vision, eye is diffusely red, no discharge.
A: Iritis (uveitis)
P: Immediate referral to MD/PA. Consult to ophthalmology.
Treatment:
Analgesic ASA for pain, dark glasses for photophobia
Mydriatic drugs: Keep pupil dilated with Atropine Ophthalmic solution 1-2 gtts up to four times a day. Ophthalmic Corticosteroids for inflammation will be give. This condition is not that common but one that can not be missed!
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Corneal Abrasion: One of the most common conditions seen, associated with contact lens misuse and foreign bodies. Part of the epithelium of the cornea is removed producing severe pain and tearing. Motion of the eye and blinking increase the pain and the foreign body sensation. Examination should be made after a drop of topical anesthetic is instilled. Identification of the defect is with fluorescein strip. In the presence of a corneal abrasion the upper lid should always be looked at for a foreign body. If present remove with a gentle wipe with a moistened "Q" tip.
S: Foreign body sensation, increased tearing and irritation
O: Injected conjunctiva, tearing (lacrimation), foreign body seen in the eye or obvious corneal defect with Fluor-staining of the eye.
A: corneal abrasion
P: Test and document visual acuity.
Removal of foreign body (MD/PA)
Bacitracin, Garamycin or Emycin ointment should be instilled into the conjunctival sac, Pressure patch the eye for 24 hours and recheck.
Note: To patch an eye place a folded oval patch over the closed eye then place an open pad on top of the eye and apply tape above the brow and bring it down diagonally across the patch to the cheek.
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Bureau of Medicine and Surgery
Department of the Navy
2300 E Street NW
Washington, D.C
20372-5300 |
Operational Medicine
Health Care in Military Settings
CAPT Michael John Hughey, MC, USNR
NAVMED P-5139
January 1, 2001 |
United States Special Operations
Command
7701 Tampa Point Blvd.
MacDill AFB, Florida
33621-5323 |
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