If the VA already service-connected your glaucoma (also called open angle glaucoma, open-angle glaucoma, angle closure glaucoma, angle-closure glaucoma), it can cause or worsen other conditions that are ratable on their own. These "secondary" claims are where many veterans leave money on the table. Below is what a service-connected glaucoma commonly leads to, why, and what evidence each one takes.
A secondary claim only works if the primary condition (glaucoma) is already service-connected, and you have a nexus — a doctor's opinion that it is "at least as likely as not" the cause. Nexus letter sample and template →
Glaucoma damages the optic nerve and usually takes your side (peripheral) vision first. The rating schedule evaluates glaucoma under the General Rating Formula for Diseases of the Eye, on visual impairment or on incapacitating episodes, whichever is higher, and sets a 10 percent minimum when continuous medication is required.
What you'd need: Formal visual field testing and corrected visual acuity for each eye, plus an eye clinic record of the glaucoma diagnosis and the eye drops or other medication you use.
Losing the ability to drive, read or work is a recognized driver of secondary depression and anxiety.
What you'd need: A mental health diagnosis and a provider opinion linking it to the vision loss.