# One-year outcome of intense pulsed light therapy for refractory meibomian gland dysfunction in patients continuously exposed to topical glaucoma medications: a comparative study

## TL;DR

This study found that IPL therapy improves dry eye symptoms in glaucoma and non-glaucoma patients, but glaucoma patients showed less improvement in eyelid blood vessels after one year.

## Contribution

The study is the first to compare IPL therapy outcomes in glaucoma patients using hypotensive agents versus non-glaucoma patients with refractory MGD.

## Key findings

- Both groups showed improved dry eye symptoms and tear film stability after IPL therapy.
- Non-glaucoma patients maintained improvements longer and showed better eyelid blood vessel and meibum expressibility outcomes.
- Glaucoma patients on hypotensive agents had less improvement in eyelid blood vessels at 12 months.

## Abstract

To evaluate the one-year effect of intense pulsed light (IPL) for refractory meibomian gland dysfunction (MGD) between patients treated with and without topical hypotensive agents.

This retrospective study included 21 MGD eyes of 21 glaucoma patients (age, 64.38 ± 13.74 years) and 21 MGD eyes of 21 non-glaucoma patients (age, 63.90 ± 13.50 years). Both arms received IPL therapy with meibomian gland expression (MGX). Propensity score matching ensured baseline comparability. Standard Patient Evaluation of Eye Dryness (SPEED) questionnaire, tear film breakup time (TBUT), lid telangiectasia, corneal staining, meibum quality and expressibility were assessed at baseline, 3-, 6-, 9- and 12-months post-treatment.

Both groups showed significant improvement in SPEED score and TBUT at 9 months, but only the non-glaucoma group maintained these improvements at 12 months (P < 0.01). While meibum quality improved in both groups at 12 months, significant improvement in lid telangiectasia and meibum expressibility was observed only in the non-glaucoma group. At 12 months, the non-glaucoma group showed less lid telangiectasia than the glaucoma group (P = 0.009). No other intergroup differences were found in other outcomes. Neither group showed significant improvement in corneal staining throughout the follow-up period.

IPL therapy is effective for treating refractory MGD in both glaucoma and non-glaucoma patients, with significant improvements in dry eye symptoms, tear film stability and meibum quality. However, patients on continuous hypotensive agents showed less improvement in lid telangiectasia at 12 months, suggesting that chronic hypotensive medication use may affect treatment efficacy.