ABILITY OF OCT TO IDENTIFY RNFL DEFECT BEFORE STANDARD AUTOMATED PERIMETRY IN GLAUCOMA

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ABILITY OF OCT TO IDENTIFY RNFL DEFECT BEFORE
STANDARD AUTOMATED PERIMETRY IN GLAUCOMA
Orna Geyer, Tagil Arev-Fishelzon, Eitan
Segev Carmel Medical Center, Haifa
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• In glaucoma, structural changes in the optic disc
  precede functional visual impairment

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Purpose

• To evaluate the capability of OCT for detection
  of nerve fiber loss before the appearance of a
  defect on visual field examination in glaucoma

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Methods

• 29 glaucoma eyes with altitudinal VF defect

• 29 healthy eyes of age-matched normal individuals

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OPTIC DISC OCT
VF
Temporal
nasal
Correlations between retinal nerve fiber layer
and visual field in eyes with nonarteritic
anterior ischemic optic neuropathy. Deleon-Ortega
J. et al, Am J Ophthalmol. 2007
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OCT- normative database
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(No Transcript)
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RNFL Thinning in the Quadrant Corresponding to
the Unaffected Hemifield
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OCT Glaucoma / Our Normal Control
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OCT Glaucoma / Our Normal Control
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Effect of the Depth of VF Defect
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• Depth of VF defect / Thinning of RNFL in the
  Quadrant Corresponding to the Unaffected
  Hemifield

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8
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No. of eyes
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2
0
-10 -15 - 20
-25 -30
MD (dB)
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Take Home Message

• OCT can recognize RNFL loss beyond a
  corresponding VF defect

• OCT may be more sensitive than VF test for the
  detection of the extent of the glaucomatous damage