Poor Dark Adaptation By The Eyes

What Causes Difficulty Adjusting To The Dark?

Difficulty adjusting to the dark can have various causes, ranging in severity from 'troubling' to 'very serious'.  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 difficulty adjusting to the dark, 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 "difficulty adjusting to the dark" as a symptom.  Here are six possibilities:
  • Cataracts
  • Liver Congestion
  • Vitamin A Need
  • Retinitis Pigmentosa
  • Zinc Need
  • Macular Degeneration

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:
diminished perspiration
wet age-related macular degeneration
dark areas under eyes
history of adult acne
bags under eyes
forgetting dreams
occasional unexplained nausea
strong-smelling urine
brittle fingernails
discontinued prednisone use
disturbed sleep
deformed toenails
... and more than 80 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of difficulty adjusting to the dark:
Cause Probability Status
Macular Degeneration 99% Confirm
Liver Congestion 65% Possible
Zinc Need 23% Unlikely
Vitamin A Need 4% Ruled out
Cataracts 4% Ruled out
Retinitis Pigmentosa 4% Ruled out
* 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.

If you indicate eye problems, The Analyst™ will ask further questions including this one:
Vision - poor dark adaptation. Do you have difficulty seeing things when going from the light into a darkened room?
Possible responses:
→ No / don't know
→ Mildly - can see well after very brief adjustment
→ Moderately - I need time to adjust
→ Seriously - can see only a little after a while
→ Severely - can see nothing at all
Based on your response to this question, which may indicate poor dark adaptation, The Analyst™ will consider possibilities such as:
Cataracts

Cataracts, characterized by cloudiness of the lens, can cause night blindness.

Liver Detoxification / Support Requirement

Reduced night vision can be linked to a variety of conditions caused by impaired liver function which in turn reduces vitamin A metabolism.

Retinitis Pigmentosa

Retinitis pigmentosa results in visual rods being destroyed early in the course of disease, resulting in night blindness.  Night blindness in children may be an early indicator of retinitis pigmentosa.

Vitamin A Requirement

Night blindness is commonly caused by a deficiency in vitamin A.  It is considered one of the first indicators of vitamin A deficiency.

Zinc Requirement

Zinc is required in order to transport vitamin A from the liver to the retina and thus zinc supplementation, especially in those who are deficient, should help improve night vision.

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