Operational Medicine 2001
Pterygium

Definition:  Wedge of tissue arising from the inner palpebral conjunctiva and extending onto the cornea. 

Signs/Symptoms:  

• Irritation

• Redness

• Injection

• Occasionally vascularized elevated wedge of tissue

• Decreased vision from increased astigmatism or extensive corneal involvement.  

• May be associated with feeling of dry eye. 

Differential Diagnosis:  

• CIN (conjunctival intraepithelial neoplasia) rare condition

• Pingueculum

• Other conjunctival tumors

• Surgical scarring. 

Causes:  

• Degeneration of the deep conjunctival tissue possibly related to chronic irritation and sun (ultraviolet) exposure.  

• More common in individuals from the countries around the equator.

Evaluation: 

• Measure size from limbus to furthest extent on the cornea in mm

• Visual acuity 

Treatment: 

• Sun Glass chit to protect from dust and sun exposure

• Lubrication with ointments or artificial tears often to reduce irritation

• Mild vasoconstrictor drop 3 to 4 times a day

• Surgical evaluation upon finishing the cruise or when getting to an MTF where an ophthalmic surgeon is available

Prognosis:  

• Good especially if mild and vision is not affected.  

• This should not interfere with duty, though can appear irritated chronically.  

• After surgical removal may recur.

This section provided by CAPT Robert B. North, Jr., MC, USN

Approved for public release; Distribution is unlimited.

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Operational Medicine 2001
Health Care in Military Settings

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