In a few cases, the vision may be worse due to very low pressure. Cataracts or wrinkle in the macula area of the eye may develop. In terms of vision correction, a patient's glasses or contact lenses may need to be changed after surgery. Both gas permeable and soft contact lenses may be worn after glaucoma filtering surgery. There may be fitting problems due to the bleb.
Special care is needed to avoid infection of the bleb.
Contact lens users should discuss these problems with their eye doctor following surgery. The Glaucoma Research Foundation acknowledges with appreciation Eve Higginbotham, M.D., for her contributions to this information sheet.