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Retinal tomographic measurements in optic disc pit.

Altan Goktas1, Sertan Goktas

  • 1Department of Ophthalmology, Kizilay Hospital, Kayseri, Turkey. altandr@hotmail.com

Clinical & Experimental Optometry
|May 15, 2010
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Summary

Heidelberg Retina Tomograph II (HRT II) measurements show optic disc pits significantly enlarge disc area. Other optic nerve head parameters remain largely unaffected, advising caution when interpreting HRT II disc area in pits.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Optic Nerve Head Analysis

Background:

  • Optic disc pit is a rare congenital anomaly.
  • Accurate measurement of optic nerve head parameters is crucial for diagnosing and monitoring optic nerve diseases.

Purpose of the Study:

  • To evaluate the impact of optic disc pit on Heidelberg Retina Tomograph II (HRT II) measurements.
  • To compare optic nerve head topographic parameters between eyes with and without optic disc pits.

Main Methods:

  • A study involving 10 patients with unilateral optic disc pit.
  • HRT II (Heidelberg Retina Tomograph II) was used for optic nerve head topographic analysis.
  • Normal fellow eyes served as controls.

Main Results:

  • Eyes with optic disc pits showed a statistically significant larger disc area compared to normal fellow eyes (p = 0.038).
  • No significant interocular differences were observed in other parameters, including cup area, rim area, cup volume, rim volume, mean cup depth, and RNFL thickness.
  • The mean retinal nerve fibre layer thickness was comparable between eyes with and without optic disc pits.

Conclusions:

  • Optic disc pit primarily affects the disc area measurement by HRT II.
  • Other morphometric parameters of the optic nerve head are not significantly altered by the presence of an optic disc pit.
  • Clinicians should exercise caution when interpreting HRT II disc area measurements in eyes with optic disc pits.