Loss of visual acuity after trabeculectomy

Area of Science:

• Ophthalmology
• Glaucoma Research
• Surgical Outcomes

Background:

• Glaucoma filtration surgery, such as trabeculectomy, can lead to visual acuity loss through various mechanisms.
• The phenomenon of
• wipe-out
• (sudden central visual field loss without other apparent cause) post-surgery has been debated.
• This study investigates the incidence and causes of visual acuity loss within three months of trabeculectomy.

Purpose of the Study:

• To determine the incidence of visual acuity loss after trabeculectomy.
• To identify the primary causes of early postoperative visual acuity loss.
• To analyze risk factors associated with different causes of visual acuity loss, including
• wipe-out
• .

Main Methods:

• A retrospective review of 508 eyes from 440 patients who underwent trabeculectomy.
• Identification of eyes with significant postoperative visual acuity loss (≥2 Snellen lines or a category change).
• Random selection of 85 control eyes to analyze risk factors for visual acuity loss.

Main Results:

• Visual acuity loss occurred in 8.3% (42 eyes) within three months post-surgery.
• The main causes were lens opacification (16 eyes), hypotony maculopathy (6 eyes), and
• wipe-out
• (4 eyes).
• Risk factors for
• wipe-out
• included older age, preoperative macular splitting, and severe early postoperative hypotony (IOP ≤ 2 mmHg).

Conclusions:

• Lens opacification is the most common cause of early visual acuity loss following trabeculectomy.
• Hypotony maculopathy is the second leading cause of visual acuity reduction.
• "
• Wipe-out
• "
• is a rare but real complication, particularly in older patients with advanced visual field defects.