The pattern of fiducials is subject to constant change.
Fovea is caused by vitreous clouding, which is a common ophthalmic disease, usually occurring in middle-aged and elderly people as well as in patients with high myopia, and is caused by the formation of cloudy clumps of metabolites within the vitreous tissue.
As the turbid mass formed in the vitreous cavity can move, when it rotates to form a different angle with the direction of the visual axis, the shape of the projection on the retina will change, and the shape of the shadows in the field of vision felt by the patient will also change.
Physiological Aedes aegypti symptoms are more stable, generally do not need special treatment. Pathological Aedes aegypti should be treated for the primary disease, such as uveitis, vitreous hemorrhage and so on.