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Retro illumination

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retro-illumination

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  • 1. RETRO-ILLUMINATION Manahan, Maclester T. OP 1-1
  • 2. Retro-illumination Object of interest is illuminated only by light reflected from the structures behind it.
  • 3. Vary angle of illumination Moderately wide beam Slit beam is offset Medium to high magnification Reflected light from iris or fundus
  • 4. Objectives 1. Assessment of pupils and all parts of the transparent ocular media (tear film, cornea, aqueous, lens, and vitreous). 2. Used to observe whether the opacity is -Obstructive – Opaque to light -Respersive – Scatters light -Refractile – Refracts, minimizes or distorts the views of background. 3. Observe anterior capsular changes -Deposits, Foreign bodies, Opacities Below Capsule.
  • 5. Procedure direct retro-illumination: The observed feature on the cornea is viewed in the direct pathway of reflected light. The angle between the microscope and the illuminating arm is about 60°. indirect retro-illumination: The angle between the microscope and slit-lamp arms is greatly reduced or increased so that the feature on the cornea is viewed against a dark background. It may be necessary to uncouple the beam.
  • 6. Alignment of reflected beam with area under observation TYPE ALIGNMENT Direct Direct and full view Indirect Adjacent Marginal Margin or edge
  • 7. Direct Retro-illumination Look to the side of the corneal block Objects viewed may have one color in direct and a different color with retroillumination.
  • 8. The object (observed structure) is viewed in the direct pathway of the reflected light. The illuminated background is directly behind the observed structure. direct retro-illumination
  • 9. Indirect Retro-illumination
  • 10. The object (observed structure) is not viewed in the direct pathway of the reflected light. The retro-illumination object is viewed against a dark non-illuminated background. The reflecting illuminated surface is to one side of the axis of observation. observed structure
  • 11. observing: Vascularization Epithelial oedema Microcysts Vacuoles Dystrophies Crystalline lens opacities Contact lens deposits
  • 12. Limbal Injection Limbal vessel engorgement seen with retroillumination and very high magnification. This may be a prelude to vascularization.
  • 13. Vascularization Vascular ingrowth into the cornea arising from a vaso-proliferative stimulus..Observe the looping and branching limbal vessels seen against the illuminated background of the clear cornea.
  • 14. Jelly Bumps Lipoidal deposition on the lens surface, common with high water content hydrogel lenses.
  • 15. findings: Expected absence of: Vascularization Epithelial oedema Microcysts Vacuoles Bullae Dystrophies Crystalline lens opacities Contact lens deposits
  • 16. tђคภк ‫ץ‬๏ย