High blood pressure
High blood pressure increases your risk of having a stroke. It also increases your risk of having a blood vessel at the back of your eye bleed of become blocked.
A stroke happens when a blood vessel in your brain bleeds or becomes blocked. This can affect your vision if it is in the part of the brain that you use to see with. It can cause blind spots in your vision that may mean that you have problem reading, are no longer able to drive, and you may bump into things.
If a blood vessel at the back of your eye bleeds or becomes blocked this may seriously affect your vision and in some cases lead to total sight loss in one eye.
Having high blood pressure also increases your risk of developing glaucoma. Glaucoma is when the pressure inside your eye damages the optic nerve at the back of your eye.