Is Glaucoma Hereditary? Understanding Your Family Risk

Not all forms of glaucoma have the same degree of genetic influence. Some types show strong hereditary patterns, while others are shaped more heavily by additional risk factors.

Primary open-angle glaucoma is the most common form of the disease and also the type most closely associated with family history. Approximately half of all people diagnosed with POAG have a relative who also has the condition. POAG develops gradually and typically causes no symptoms in its early stages, which is why family members of affected individuals benefit greatly from proactive screening. Mutations in the myocilin (MYOC) gene account for roughly three to four percent of all worldwide POAG cases.

Juvenile open-angle glaucoma (JOAG) appears between childhood and early adulthood and has a particularly strong genetic link. Most cases of JOAG with a clear family history are caused by mutations in the MYOC gene. This form follows an autosomal dominant inheritance pattern, meaning a child of an affected parent has a 50 percent chance of inheriting the causative mutation.

Angle-closure glaucoma can also run in families, though its hereditary component is less straightforward than that of open-angle glaucoma. Research suggests that having a sibling with primary angle-closure glaucoma may increase your risk by more than 13 times. Structural features of the eye, such as a naturally shallow anterior chamber or a shorter eye length, tend to be inherited traits that predispose certain individuals to this form of the disease.

Congenital glaucoma, which is present at birth or develops in early infancy, can have a genetic basis as well. Some cases follow autosomal recessive inheritance patterns, meaning both parents must carry a copy of the responsible gene for a child to be affected. Genes such as CYP1B1 have been identified in families with congenital glaucoma. If your family has a history of childhood glaucoma, a pediatric eye doctor can recommend appropriate monitoring for your children.

Genetic testing is available for certain forms of glaucoma, particularly those linked to known gene mutations such as MYOC. Testing is most useful in families with juvenile open-angle glaucoma or when a specific mutation has already been identified in a relative. First-degree relatives of MYOC mutation carriers have a 50 percent chance of inheriting the mutation and are strong candidates for testing. For the majority of adult-onset POAG cases, which involve complex interactions among multiple genes, genetic testing is not yet part of routine clinical practice.

While there is currently no guaranteed way to prevent glaucoma, early detection and treatment can effectively slow or halt disease progression in most patients. Maintaining a healthy lifestyle that includes regular exercise, a balanced diet, and avoiding smoking may support overall eye health. The most impactful step you can take is to keep up with regular glaucoma screenings so that any changes are caught and treated promptly.

Adults with a first-degree relative who has glaucoma should begin comprehensive eye exams by age 40 at the latest. If you are African American, Hispanic, highly myopic, or have other additional risk factors, screening should start earlier, often in your twenties or thirties. Children of parents with juvenile or congenital glaucoma may need monitoring from an even younger age, as determined by their eye doctor.

The inheritance pattern depends on the type of glaucoma. Juvenile open-angle glaucoma caused by MYOC mutations follows autosomal dominant inheritance, meaning only one copy of the mutated gene from one parent is enough to significantly increase risk. Congenital glaucoma often follows autosomal recessive inheritance, requiring a gene copy from both parents. Most adult-onset primary open-angle glaucoma results from the combined effects of many genes, each contributing a small amount of risk, rather than a single inherited mutation.

In some families, it may appear that glaucoma skips a generation, but this is usually explained by incomplete penetrance, meaning a person carries the genetic risk but does not develop the disease during their lifetime. It is also possible that a previous generation had early or mild glaucoma that was never diagnosed. Regular visual field testing and optic nerve evaluations help identify the disease even when a person has no symptoms, reducing the chance that glaucoma goes undetected in any generation.

Share as much detail as you can about any relatives who have been diagnosed with glaucoma, including which type they have, at what age they were diagnosed, and what treatments they have received. Information about relatives who have experienced significant vision loss from glaucoma is also helpful. Even if you are unsure of the exact diagnosis, mentioning that a family member uses eye drops for eye pressure or has had glaucoma surgery gives your doctor valuable context for assessing your risk.