Is redness normal after SLT laser treatment?

What's normal

A pink or mildly bloodshot eye in the first day or two after SLT lines up with the mild inflammation that the Glaucoma Research Foundation describes as common but generally mild, and with its statement that the vast majority of SLT complications are mild and self-limiting. The contact lens placed on the eye during the laser also contributes to surface irritation. The Glaucoma Research Foundation notes the eye may be a bit irritated after laser surgery.

Anti-inflammatory drops for a couple of days are the standard response, per both the Glaucoma Research Foundation and BrightFocus Foundation. Redness that is fading day over day, with the eye feeling steadily more comfortable, is the direction you want to see.

Typically fading over the first day or two rather than intensifying.

When it stops being normal

Redness that is worsening rather than fading, especially with increasing pain, discharge, or reduced vision, needs to be reported. The American Academy of Ophthalmology lists eye redness, swelling, and pain among possible complications of laser trabeculoplasty, and StatPearls lists corneal edema and low-grade iritis among recognized complications.

A deeply red, painful eye with blurred vision, headache, or nausea fits the emergency picture the American Academy of Ophthalmology describes for a sudden rise in eye pressure. Call your ophthalmologist right away in that situation.