The immediate relatives of people with glaucoma are more likely to develop the condition and should have their eyes examined periodically after the age of 40 to look for the early signs.
Some families have a number of members with glaucoma and may carry a genetic risk for the condition. If glaucoma appears at a younger age in your family, eye checks may need to start earlier.
In the early stages of glaucoma there are usually no symptoms. If detected early, treatment is likely to be more effective.