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Flashcards in Eye problems Deck (18):
1

Strabismus

1. Failure of eyes to remain aligned
2. Problem with brain/ extraocular muscles
3. Impaired vision/double vision

2

Glaucoma

1. Drainage system tof aqueous humor ( schlemm's canal/trabecular meshwork) becomes blocked
2. Increased pressur ein anterior chamber, then the whole eye
3. Damages the optic nerve

3

Two types of gluocoma

1. Open angle gluacoma - slow clogging causes gradual increase in pressure -> slow loss of vision

2. Closed angle - lens pushed against iris, narrow passage of aqeous humor _> acute blockage, eye pain, sudden loss of vision

4

Leukocoria

• White pupil - abnormal white reflection from retina of the eye
1. Retinoblastoma (malignant tumor) is a common cause
2. Also be caused by retinal detatchment/cataract

5

Retinis Pigmentosa

1. Genetic degenerative disease of retina
- Loss of peripheral vision gradually - tunnel vision
- blindness
-Photospia - flahse sof light

6

Diabetic retinopathy

High blood pressure
1. Blood leaks out of blood vessels
2. Damage to blood vessels

Decrease in blood supply to the retina causes retinal damage

7

Cataracts

1. Loss of transparency of the lens

8

Age related macular degeneration

1. Degeneration of macula - loss of central vision but peripheral vision is maintained
- most common cause of blindness over 50
- age smoking hypertension are risk factors

9

Retinal detatchment

1. Retina begins to pull away from the blood vessels that supply it with nutrients etc
• Causes : trauma/thinning with age
2. Peripheral vision is lost
3. If macula is still attatched - keep central vision

10

Keratocconus

• Ageing process, lens becomes less flexible due to hardening of the lens
• Eye doesn't focus light evenly on retina

11

Astigmatism

• Refractive errors of the eye in which the frontal process is shaped like a rugby ball

• Irregular curvature of the cornea means that the eye is not focused on the retina

12

Hyperopia

Longsightedness
• Light rays are brought to focus behind the retina
• Convex lens

13

Prebyopia

• Ageing process, lens becomes less flexible due to hardening of the lens
• Eye doesn't focus light evenly on retina

14

Keratocconus

Conical shaped cornea that scatters the light that passes through it causing blurry vision
• Occurs mainly in young people

15

Ischaemic optic neuropathy

• blood does not flow properly to the optic nerve
• Lasting damage to optic nerve
• Sudden loss of vision in one or both eyes

16

CAUSES OF RAPID LOSS OF VISION

• RETINAL VEIN OCCLUSION
• RETINAL ARTERY OCCLUSION
•ISCHAEMIC OPTIC NEUROPATHY
•VITROEUS HAEMORRAGE
•RETINAL DETATCHMENT
•ACUTE GLUACOMA

17

CAUSES OF SLOW LOSS OF VISION

• Glaucoma
• Cataracts
• Age related macular degeneration
• Diabetic retinopathy

18

Thyroid eye disease

• Eye muscle and fatty tissue behind the eye become inflamed.
• eye is caused to be pushed forward and bulged
• Retraction of eyelid, restriction of eye movement and pressure on nerves