Purkinje images

4.6
(12)

No of Purkinje images: 4

No.

Formed on

Type

1

Anterior surface of cornea

Virtual

2

Posterior surface of cornea

3

Anterior surface of lens

4 Posterior surface of lens

Real & inverted

Detection:

  • Purkinje 1 is detected by Placido’s disc/ Keratoscopy
  • Purkinje 2 is detected by specular microscopy.

 

Measurements:

  • Purkinje 1 helps to measure corneal curvature
  • Purkinje 1 & 2 helps to measure corneal thickness
  • Anterior chamber depth is measured by Purkinje 2 & 3
  • Lens thickness is measured by Purkinje 3 & 4.

Other measurements in Ophthalmology:

  • Corneal curvature is measured by Keratometry
  • Corneal thickness is measured by Pachymetry
  • Shape of anterior surface of cornea is assessed by Placido’s disc/ Keratoscope
  • Posterior surface of cornea (including endothelium) is assessed by Specular microscope.

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