I have very light 'constant' flickering(not flashes) in peripheral vision of both eyes(more in left) in dark since a week? lattice review in 3 days.

Need an exam: This can mean some changes in the retina. If vision. Good not to worry, but you need to have the eyes examined.

See ophthalmologist: Flickers can be as simple as migraines or blood pressure changes, but can also be something like a retinal tear or hole which can quickly become an emergency. I highly suggest seeing an ophthalmologist for this as soon as possible.