regions of retina and assessing

what happens at the fovea with blood vessels

none present - avascular to allow maximum light to reach the photoreceptors

so retina relies completely on blood supply from choroid

foveola

centre of fovea- rod free

250- 300 microns diamter

covers 1 degree of visual field

parafovea

area directly around fovea

½ mm wide

where rods start appearing

perifovea

1.5mm wide- extends to optic disc

what are all these regions combined

the macula

• sometimes has yellow pigment

what’s the ora serrate

most anterior part of the retina

regions

benign degenerations

assessing retina

may see reflective light on retina- especially on young people when pictures taken on fundus photo

light may follow blood vessels- not a problem on retina

may see foveal reflex (light)when doing Volk but not usually in photos

what’s wrong with this image

fluid built up under the fovea