Nearsightedness or farsightedness can have various causes, ranging in severity from 'minor' to 'needs attention'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose nearsightedness or farsightedness, we could:
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Are you nearsighted or farsighted? For additional information see optical prescription.
Possible responses:→ No, my vision is fine / don't know
→ I'm very nearsighted / -7.0 diopters or over
→ I'm somewhat nearsighted / up to -7.0 diopters
→ I'm somewhat farsighted / up to +7.0 diopters
→ I'm very farsighted / +7.0 diopters or over
Acute glaucoma is usually due to the shape of the eyeball and is most common in long-sighted people.
If you wear corrective lenses or are over 50, eye exams should be performed every two years or so. If your vision doesn't require correction and you are under 50, an eye exam (including screening for glaucoma and visual acuity) should be performed every three to five years.