High A1c Levels Linked to Eye Surgery Risks

Researchers found higher preoperative hemoglobin A1c levels increase the risk of post-surgical complications.

Updated on Oct. 11, 2026 in Diabetes

High A1c Levels Linked to Eye Surgery Risks

Live Poll

Should patients prioritize lowering A1c levels before undergoing elective eye surgery to reduce complication risks?

Studies have revealed that elevated preoperative hemoglobin A1c levels are associated with increased rates of eye complications after common procedures. The findings indicate that patients with poorly controlled diabetes face higher risks of post-surgical cystoid macular edema and infections.

Why it matters

Severe hyperglycemia functions as an independent predictor of long-term infection after tube shunt surgery because it impairs immune defenses and slows wound healing. These results suggest that better preoperative management could improve safety for patients undergoing ocular procedures.

Patients with preoperative A1c levels above 8.4% faced a 1.93 times higher five-year hazard for infections like blebitis or endophthalmitis compared to those with normal levels. Additionally, pre-existing diabetic retinopathy tripled the odds ratio for postoperative cystoid macular edema.

The players

VA Health System

This network provides comprehensive healthcare services to military veterans across the United States.

TriNetX

This global clinical research network aggregates electronic health record data to support medical research and trial design.

The details

Investigators analyzed data from 6,808 cataract surgery patients and 121,164 controls, finding that each 1% increase in A1c elevates the risk of cystoid macular edema by 6%. Separate analysis of the TriNetX clinical research network showed that pre-existing myopia further increases the hazard ratio for post-shunt surgery infections to 3.58.

The VA Health System data spanned the years 2010 to 2022.
The follow-up period for measuring tube shunt surgery infection risk lasted 5 years.

Health Landscape

These findings extend the scope of the American Academy of Ophthalmology clinical guidelines by providing specific quantitative risk markers for surgical outcomes. The research highlights a shift toward incorporating glycemic control metrics into the preoperative planning phase to reduce avoidable ocular complications.

Patients with diabetes may now face more rigorous preoperative counseling and requirements to stabilize blood sugar levels before scheduling cataract or tube shunt surgeries. These findings may lead to doctors delaying non-urgent procedures until A1c levels meet safer clinical thresholds.

The takeaway

Patients planning for eye surgery should discuss their recent hemoglobin A1c results with their ophthalmologist to better understand their specific surgical risks. Controlling blood sugar in the weeks leading up to a procedure may significantly lower the likelihood of post-operative complications.