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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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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Structure-function relationships between spectral-domain OCT and standard achromatic perimetry.

Naveed Nilforushan1, Nariman Nassiri, Sasan Moghimi

  • 1Glaucoma Division, Jules Stein Eye Institute, UCLA, Los Angeles, California 90095, USA.

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Summary

Spectral-domain optical coherence tomography (SD-OCT) reveals structure-function relationships in early glaucoma. Rim area (RA) correlates better with visual field (VF) sensitivity than retinal nerve fiber layer (RNFL) thickness.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Early glaucoma detection is crucial for preventing vision loss.
  • Understanding structure-function relationships aids in diagnosing and monitoring glaucoma progression.
  • Spectral-domain optical coherence tomography (SD-OCT) provides high-resolution imaging of the optic nerve and retinal nerve fiber layer (RNFL).

Purpose of the Study:

  • To investigate the structure-function relationships in patients with suspected or early glaucoma.
  • To correlate measurements from SD-OCT (RNFL thickness, rim area) with standard achromatic perimetry (visual field sensitivity).

Main Methods:

  • Retrospective analysis of 136 eyes from 97 patients with suspected or early glaucoma.
  • Acquisition of high-quality peripapillary RNFL/optic disc measurements and 24-2 SITA-Standard Humphrey visual field (VF) data.
  • Application of components of variance models to correlate global and sectoral RNFL thickness and rim area (RA) with global and regional VF sensitivities (in dB and 1/L scales).

Main Results:

  • Global rim area (RA) showed a stronger correlation with mean deviation (MD) than average RNFL thickness (P = 0.002).
  • The strongest correlations were found between superonasal VF cluster sensitivity and inferotemporal RA (R(2) = 0.26) or RNFL thickness (R(2) = 0.24) in the dB scale.
  • In glaucoma suspects, correlations were highest between superonasal VF cluster and inferotemporal RA (R(2) = 0.16) or RNFL thickness (R(2) = 0.10).
  • Correlations were slightly stronger in the dB scale than the 1/L scale and exhibited a linear relationship.

Conclusions:

  • Structure-function relationships in early glaucoma are detectable using SD-OCT.
  • Rim area (RA) measurements demonstrate stronger correlations with visual field (VF) thresholds compared to RNFL thickness.
  • A linear model effectively describes the observed structure-function relationships in early glaucoma.