Ophthalmology - General medical disorders and the eye Flashcards Preview

Year 4 - SPM > Ophthalmology - General medical disorders and the eye > Flashcards

Flashcards in Ophthalmology - General medical disorders and the eye Deck (17):

What signs are associated with long term hypertension?

There are mild fundal changes associated with hypertension:
- "silver wiring" of the retinal arteries
- arteriovenous nipping
- arteriolar narrowing (most reliable sign)


What findings are associated with accelerated hypertension?

Malignant hypertension is classically associated with swelling of the optic nerve head. Any patient with hard exudates, cottonwool spots, or haemorrhages as a result of hypertension has a grave prognosis. Patients with these fundal signs should have their BP checked and diabetes excluded.

Retinal vein occlusion is also more common in hypertensive patients.


How common is thyroid eye disease?

It affects between 25-50% of patients with GRAVES disease.


What is the pathophysiology of thyroid eye disease?

It is thought to be caused by an autoimmune response against an antigen, possibly the TSH receptor leading to retro orbital inflammation. Inflammation results in collagen and glycosaminoglycan deposition in extra occular muscles.


How can thyroid eye disease be prevented?

Smoking is THE most important modifiable risk factor for the development of thyroid eye disease.

Radio-iodine treatment may increase the inflammatory symptoms seen in thyroid eye disease. Prednisolone may help to reduce this risk.


Outline the features of thyroid eye disease?

The patient may be eu, hypo, or hyperthyroid at the time of presentation.

Features include:
- exophthalmos
- conjunctival oedema
- optic disc swelling
- optic neuropathy (this is relatively rare, the fundal signs include vascular congestion and swelling or atrophy of the optic head. There may be "folds" in the choroid caused by pressure on the globe)
- ophthalmoplegia
- inability to close the eyelids may lead to sore, dry eyes.

If severe and untreated patients can be at risk of exposure keratopathy


How should thyroid eye disease be managed?

Topical lubricants may be needed to help prevent corneal inflammation caused by exposure.


How common are ocular manifestations of rheumatoid arthritis?

These are common, and occur in 25% of patients (they also occur in other collagen vascular diseases such as SLE, scleroderma, and dermatomyositis)

Manifestations include:
- keratoconjunctivitis sicca (most common)
- episcleritis
- scleritis (erythema and pain)
- corneal ulceration
- keratitis

Iatrogenic causes include steroid induced cataracts, and chloriquine retinopathy.

Patients normally complain of dry, gritty and sore eyes.


How can rheumatoid arthritis ocular manifestations be treated?

Treatment consists of replacement artifical tear drops instilled as often as necessary. Simple ointment may also be helpful, but this will blur the vision if used during the day. If there is an aggregation of mucus, mucolytic eye drops (e.g. acetylcysteine) may help, but patients should be warned that these sting.


What ocular complications occur in seronegative arthritides?

Seronegative arthritis includes ankylosing spondylitis, Reiter's syndrome, psoriatic arthritis, and arthritis associated with inflammatory bowel disease.

Acute anterior uveitis is much more common in these patients and can lead to secondary cataract. If a patient with any of these conditions has a red eye, anterior uveitis should be suspected.


What are the risk factors for ocular involvement in childhood seronegative arthritis?

Seronegative childhood arthritis is a particularly important cause of chronic anterior uveitis. Risk factors include:
- female sex
- fewer than five joints affected
- antinuclear antibodies

The danger in these cases is that the eyes are often white and pain free, and the child may not complain of any visual problems. There may be secondary cataracts which cause irreversible ambylopia.


How does rosacea affect the eyes?

Blepharitis is common in rosacea, and this can result in recurrent chalazia and stye. The abnormal lid and lipid secretion affect the tear film and "dry eye" syndrome occurs.


How is eye involvement in rosacea treated?

Treatment is with:
- tear substitutes
- treatment of any co-existing blepharitis
- systemic tetracycline (250mg QDS) - avoid use in pregnant or lactating women


How can sarcoidosis affect the eye?

Acute and chronic uveitis (can result in cataract)
Band of calcium deposited in the cornea (band keratopathy)
Lacrimal gland infiltration resulting in "dry eye" syndrome
Granulomatous process may affect the posterior part of the eye as vasculitis and sometimes infiltration of the optic nerve.


How does congenital rubella affect the eye?

Refractive error
Retinopathy ("salt and pepper" appearance)

The child may also be deaf and have severe learning difficulties, so early recognition and treatment are important.


Name some of the ocular complications of AIDS

Retinal detachment
Cystoid macula oedema

Manifestations of HIV include Kaposi's sarcoma of the conjunctiva, HIV microvasculopathy (retinal haemorrhages and cottonwool spots) and vasculitis.


How does ocular cytomegalovirus present?

Ocular CMV is a complication of HIV infection. It presents as a slowly progressive necrotising retinitis with areas of retinal opacification and haemorrhages and exudates along vascular arcades. About 20-30% of patients with CMV retinitis will develop retinal detachment.

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