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OPTIC DISC EVALUATION IN
GLAUCOMA
1.5MM
TH- Tinted halo
PM-Pallor margin
CM-Cup margin
KINKING OF VESSELS
Retinal nerve fibre bundle defects inferotemporal
wedge shaped defect Same defect in red free light
TOPOGRAPHIC IMAGE,REFLECTANCE IMAGE
TOPOGRAPHIC 3D IMAGE
TOPOGRAHIC REFLECTANCE
NORMAL EYE WITH GLAUCOMA SHOWING NFL THINNING
Thick RNFL coded yellow, orange, red Thin RNFL coded blue and green
Based on the assumption that RNFL is birefringent ( due to parallel microtubules), polarized diode
laser light(780nm) is used that penetrates tissue
optic disc evaluation in glaucoma.pptx
optic disc evaluation in glaucoma.pptx
optic disc evaluation in glaucoma.pptx
optic disc evaluation in glaucoma.pptx
optic disc evaluation in glaucoma.pptx

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optic disc evaluation in glaucoma.pptx

Editor's Notes

  1. Notching : localized defect of nrr in cup side ; bayonetting: as the cup enlarges vessels are bent along the sharp edge of the cup
  2. Other vascular signs
  3. Emitted beam is directed in the x-axis and y axis along a plane of focus perpendicular to the optic axis using 2 oscillating mirror to obtain a 15x15 degree 2D image reflected fro the surface of retina and optic disc coming out to the sensor through a small pinhole aperture
  4. Birefringent is the property of media that scatters lights rays in various axis d/t changes in refreactive index.so polarized light used..where rays travels in single wavefont