What is Filtering Microsurgery?
In glaucoma, the eye’s inner fluid pressure can build up and damage the optic nerve, the nerve that carries visual pictures to the brain. Damage to the optic nerve can lead to vision loss. When medicines and laser surgeries do not lower pressure enough, eye doctors may recommend a procedure called filtering microsurgery (sometimes called conventional or cutting surgery). In filtering microsurgery, a tiny drainage hole is made in the sclera (which is the white part of the eye) in a procedure called a trabeculectomy or a sclerostomy. The new drainage hole allows fluid to flow out of the eye and helps lower the eye pressure. This prevents or reduces damage to the optic nerve. How does the eye doctor determine if filtering surgery is needed? Often, laser surgery is used before filtering microsurgery, unless the eye pressure is very high or the optic nerve is badly damaged. During laser surgery, the laser, a tiny but powerful beam of light, is used to make a scar in the eye’s trabecular mes
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