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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...

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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Associations between retinal nerve fiber layer abnormalities and optic nerve examination.

D Cettomai1, G Hiremath, J Ratchford

  • 1Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD, USA.

Neurology
|September 3, 2010
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Summary

Optical coherence tomography (OCT) detects retinal nerve fiber layer (RNFL) abnormalities in multiple sclerosis (MS) patients, even when optic atrophy is not clinically apparent. This technology shows promise for future clinical use.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Medical Imaging

Background:

  • Retinal nerve fiber layer (RNFL) abnormalities on optical coherence tomography (OCT) are indicators of axonal loss and visual dysfunction in multiple sclerosis (MS).
  • The clinical utility of OCT-detected RNFL abnormalities in routine MS management remains understudied.

Purpose of the Study:

  • To investigate the role of OCT-measured RNFL thickness in identifying visual pathway damage in MS patients.
  • To compare OCT findings with clinical assessments of optic atrophy and afferent pupillary defect (APD).

Main Methods:

  • 240 MS patients underwent clinical and OCT examinations.
  • Abnormal RNFL thickness was defined using the OCT 5th percentile.
  • RNFL thickness and RNFL thickness ratios were compared between eyes with and without clinical signs of optic atrophy and APD.

Main Results:

  • Eyes with clinically diagnosed optic atrophy or APD showed significantly reduced mean RNFL thickness compared to unaffected eyes (p < 0.001).
  • Physicians' accuracy in detecting optic atrophy and RAPD using clinical examination was moderate, with varying sensitivity and specificity.
  • OCT identified RNFL abnormalities in many patients without clinical signs of optic atrophy.

Conclusions:

  • OCT detects RNFL abnormalities in a significant number of MS patients who do not exhibit clinical signs of optic atrophy.
  • Further research is required to integrate OCT measures into neuro-ophthalmological assessments for optic atrophy and APD.
  • OCT-measured RNFL thickness is expected to play a crucial role in future clinical MS management.