الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
OCT is an accurate method allows to get informations about deeper
structures like the choroid and quantitative measurement of choroidal
thickness in normal persons & in diabetic patients and correlates them to
visual functions.
Recent reports showed successful examination and measurement of
choroidal thickness in normal and pathologic states using the Heidelberg
Spectralis .Our groups studied the choroidal thickness of 60 eyes with
different stages of diabetic retinopathy and 25 eyes of normal person as a
control, using a SD-OCT. The choroidal thickness is measured manually
perpendicularly from the outer edge of the hyperreflective RPE to the inner
sclera (choroid–sclera junction) using the OCT software. Both groups report
that the choroid is thickest subfoveally and thin nasally more than temporally.
We showed that choroidal thickness decreases as the disease progresses
from mild–moderate to severe NPDR to PDR compared to normal subjects.
Presence of diabetic macular edema is associated with a significant decrease
in the choroidal thickness.
There were significant direct relation between choroidal thickness &
BCVA; the lower the choroidal thickness the worse the BCVA.
Patients with diabetic macular edema presented the lowest mean value
of choroidal thickness and the worst BCVA.
Best resolutions, high definition, and refined results with EDI-SD-OCT
may bring answers with clarity and precision without further definition.
OCT is an excellent replacement of invasive exams to detect and
evaluate choroidal structural changes, and it may, in the near future, explain
the functional changes and the visual results of diabetic retinopathy, diabetic
macular edema & diabetic choroidopathy.