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Placido Disc
Medicoach International Academy
• A flat disc with alternative black
and white ring concentrically
arranged around a +3.00D
convex viewing lens.
• This convex lens help to observe
the corneal reflection without
accomodation.
• Also help to magnify the image
• Measure around 7mm of
cornea.
Clinical Interpretation
• Circular image - Spherical cornea
• Elliptical image - Astigmatism
• Distorted image - Corneal scar or
other irregularities
• Asymmetrical image-Keratoconus
• Crowding of ring - Steep cornea
• Spread out of ring - Flat cornea
Thankyou

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PLACIDO DISC .pdf

  • 2.
  • 3. • A flat disc with alternative black and white ring concentrically arranged around a +3.00D convex viewing lens. • This convex lens help to observe the corneal reflection without accomodation. • Also help to magnify the image • Measure around 7mm of cornea.
  • 4.
  • 5. Clinical Interpretation • Circular image - Spherical cornea • Elliptical image - Astigmatism • Distorted image - Corneal scar or other irregularities • Asymmetrical image-Keratoconus • Crowding of ring - Steep cornea • Spread out of ring - Flat cornea
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.