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Dry Eye Syndrome

Multiple Cause Diagram (MCD) to explore treatment options of chronic blepharitis

Hanns-Jürgen Hodann
Multiple Cause Diagrams (MCDs) can be used to find solutions to systemic problems. This diagram tries to explore treatment options that could theoretically be available to a person who has been diagnosed with a particular type of blepharitis (inflammation of eye lids). This type of blepharitis often leads to 'pink eye' and  'dry eye syndrome'. It  is caused by rosacea of the eye lids, a systemic disease which can only be controlled but not cured.  The MCD also assumes that the patient's tear glands do not produce enough tears, which  further complicates his eye condition.  The broken green lines indicate treatment options.Their aim is to weaken or disrupt links that keep the malignant process going.
Hypothetically a person afflicted by this condition could construct a MCD similar to the one shown, based on authoritative information from his ophthalmologist and bonafide medical websites. It could serve to improve  his /her  understand of their condition and the treatment  available. As such, I believe this diagram demonstrates the usefulness of MCDs. 

Health Posterior Blepharitis Dry Eye Syndrome Meibomitis Rosacea Ocular

  • 1 year 3 months ago


Hanns-Jürgen Hodann
Ophthalmologist Craig Blackwell described the 'Dry Eye Cycle' in two excellent videos with graphic descriptions. From his description it becomes clear that the Dry Eye Cycle really consist of two self-reinforcing feedback loops. I have constructed these feedback loops here because they help explain the cycle, and understanding it may be very useful for suffers of the often debilitating 'dry eye syndrome '. The process usually starts with one of two deficiencies: the oil secreted from oil glands is too thick and does not adequately cover the aqueous film leading to evaporation and dryness or tear glands do not produce enough tears.  Dr. Blackwell stresses the role of inflammation which can lead to the progressive worsening of the condition and  which should be controlled. He suggests various treatments. I highly recommend watching the videos

Dry Eye Syndrome Health Ophthalmology

  • 3 years 3 weeks ago