Scotoma,what is means .

As absence a vision function is on the limiting part, contoures of which not matching with periphery borders of vision field is calling scotoma. As such vision destroys are not feeling by patients and causing is on the special methods time of test as negative scotoma. As in a few cases she is feeling for patients as local shadow or spot in the vision field as positive scotoma. As they are having any form as oval, circle,arc, sector, wrong form. As in a scotoma region a vision function is a full absence,such scotoma calls as absolute. As if patient feeling just nidus destroy of clear perception item, thus such scotoma defining as relative. As in a same patient with scotoma are on the different colours is finding as absolute and relative .As in pathological scotomas in a patient having a physiologic scotoma.This is a blind spot is absolute scotoma of oval form, as in temple vision of vision field as a disc projection of vision nerve, as this side not having a light sensitive elements.Physiologic scotomas is having a clear putting sizes and localization, and rising in sizes of physiologic scotomas is evidences about a pathology.
As rising in sizes for blind spot is causing for diseases as glaucoma, hypertension, disc edema of vision nerve.And for the finding scotomas are used a hard methods for tests a vision field, as today process is easy, thanks to use an automatic perimeters and testers of central vision and test is having within a few minutes.