Nearsightedness Or Farsightedness

What Causes Nearsightedness Or Farsightedness?

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.

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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:

  • Research the topic
  • Find a doctor with the time
  • Use a diagnostic computer system.
The process is the same, whichever method is used.

Step 1: List all Possible Causes

We begin by identifying the disease conditions which have "nearsightedness or farsightedness" as a symptom.  Here are two possibilities:
  • Glaucoma
  • Need For Preventive Health Measures

Step 2: Build a Symptom Checklist

We then identify all possible symptoms and risk factors of each possible cause, and check the ones that apply:
heart attack(s) in father
glaucoma in close family members
having had eye injury or surgery
no recent doctor visit
no recent health checkup
cancer in family members
major steroid use
hypertension in parents
no recent Pap smear test
not having had recent lab tests
heart disease in family members
... and so on

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of nearsightedness or farsightedness:
Cause Probability Status
Glaucoma 95% Confirm
Need For Preventive Health Measures 71% Possible
* This is a simple example to illustrate the process

Arriving at a Correct Diagnosis

The Analyst™ is our online diagnosis tool that learns all about you through a straightforward process of multi-level questioning, providing diagnosis at the end.

In the Eyes/Ocular Symptoms section of the questionnaire, The Analyst™ will ask the following question about nearsightedness or farsightedness:
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
Based on your response to this question, which may indicate having normal uncorrected vision, being very nearsighted, being somewhat nearsighted, being somewhat farsighted or being very farsighted, The Analyst™ will consider possibilities such as:

Acute glaucoma is usually due to the shape of the eyeball and is most common in long-sighted people.

Need For Routine Preventative Health Measures

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.

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