Researchers found diplopia in one-fifth of 195 medically and surgically treated adult patients with glaucoma, according to a prospective study in Ophthalmology.
Researchers utilized the Diplopia Questionnaire to collect data on symptoms of the condition.
Diplopia was reported in 41 of 195 patients (21%).
A total of 47 patients had undergone glaucoma drainage device (GDD) surgery using Baerveldt 350, Baerveldt 250 (Abbott Medical Optics, Abbott Park, Ill.) or Ahmed FP7 (New World Medical, Rancho Cucamonga, Calif.), 61 patients underwent trabeculectomy, and 87 patients were medically treated.
Binocular diplopia due to surgery occurred in 11 of 47 patients (23%) undergoing GDD placement and in 3% of patients undergoing trabeculectomy.
The most common type of strabismus associated with binocular diplopia due to glaucoma surgery was hypertropia, researchers said.
Binocular diplopia not due to surgery was found in similar proportions of GDD, trabeculectomy and medically treated cases of 6%, 8% and 11%, respectively.
Diplopia seems to be under-recognized in patients with glaucoma managed both medically and surgically, according to researchers.
Diplopia from surgery seems to be more common in patients after GDD, specifically patients receiving the Baerveldt 350, compared with patients after trabeculectomy, they concluded. The researchers suggest counseling patients on the occurrence of diplopia associated with GDD surgery.
“In addition, it may be helpful for patients undergoing glaucoma surgery to have a standardized assessment of diplopia and strabismus both before and after surgery,” according to researchers. – by Abigail Sutton
Disclosure: The researchers reported no relevant financial disclosures.