Blurred and distorted vision
Blurred vision can similarly come from the eye or brain. It may take an ophthalmologist or neuro-ophthalmologist to distinguish between diagnoses and determine whether the condition is harmless or sight or life threatening.
Migraines can cause spectacular loss of vision that typically lasts for twenty minutes, recovers and can be followed by headaches. These are usually harmless. Occasionally, more serious conditions such as brain tumour can mimic migraines. If you or your doctor or optometrist are in any doubt it is best to be seen by an ophthalmologist or neuro-ophthalmologist.
Macular degeneration and macular causes.
Diseases of the macula typically cause central distortion and blur. This Sight threatening complications of macular degeneration typically cause progressive persistent central distortion in one eye. A macula hole can cause overall loss of central vision
Cataracts cause blur without much distortion. As they develop they can cause rapid changes in your spectacle prescription. If you think that you are having frequent changes to your glasses, ask your optometrist if its due to developing cataract as this may need to be addressed first.
Simple refractive errors and astigmatism similarly
cause generalised blur.
Simple refractive errors and astigmatism similarly cause generalised blur.
Blur from stroke
Stroke of the brain affecting eyesight typically causes people to lose a piece of their side vision. Often people are not aware that they have lost a significant portion of their sight because the mind “ fills in “ the defect though this does not stop people accidentally driving into or walking into objects in their blind segment
Other conditions.Many other conditions can cause blur and distorted vision. They all require a careful history and examination by an experience clinician and sometimes ancillary tests such as topography perimetry, retinal scans and angiography. Occasionally referral to a neurologist or for electrophysiological testing is required in certain cases.