WebMD Answers
It is unusual for blepharitis to cause serious problems. However, blepharitis can lead to a number of other conditions.
Blepharitis does not affect vision generally, although a poor tear film may intermittently blur vision, causing varying amounts of fluctuating vision during the day. Call your ophthalmologist if you develop significant changes in vision, since this symptom is not due to the blepharitis.
Also call your ophthalmologist if you develop significant pain in either or both eyes, if symptoms become worse or last for longer than two weeks, or if you develop a sore on the eyelid that persists or increases in size, especially if it is red, bleeding, and not healing.
This answer should not be considered medical advice...
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