Is a pineal cyst of 0.7x1.0 x1.0 cm very large? and can they shrink on there own? how can they tell if it is a cyst or tumor? cause of zig zag vision

Pineal cyst: It is not big. It is probably benign and can be evaluated by mri.Usually they don't shrink . This size cyst should not cause any visual problems

Ocular migraines!: Ocular migraines are a form of migraines that take place in the occipital cortex (part of the brain that interprets/controls vision). They lack the severe headache as common migraines. The symptoms are usually all or mostly visual and are typically described as flashing of light or ziz-zag lights in the vision. They usually last less than 30 minutes and affect the vision out of both eyes.