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Related Concept Videos

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Functional Dynamics of Deafferented Early Visual Cortex in Glaucoma.

Gokulraj T Prabhakaran1, Khaldoon O Al-Nosairy1, Claus Tempelmann2

  • 1Department of Ophthalmology, Otto-von-Guericke University, Magdeburg, Germany.

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In advanced glaucoma and retinitis pigmentosa, the brain

Keywords:
fMRIfeedbackglaucomalesion projection zoneplasticityvisual cortex

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Medical Imaging

Background:

  • Acquired blindness, such as from advanced glaucoma, affects visual cortex function.
  • Previous studies in retinitis pigmentosa showed task-dependent activation in the lesion projection zone (LPZ) of the visual cortex.
  • It is unknown if similar mechanisms apply to advanced glaucoma.

Purpose of the Study:

  • To investigate if task-dependent activation in the visual cortex LPZ occurs in advanced glaucoma.
  • To compare these findings with retinitis pigmentosa and healthy controls.
  • To explore the role of top-down versus bottom-up mechanisms in visual cortex plasticity.

Main Methods:

  • 3T fMRI scans were acquired during visual stimulation in participants with advanced glaucoma, retinitis pigmentosa, and healthy controls.
  • Participants performed a passive viewing (PV) task and a one-back task (OBT) involving motion direction detection.
  • fMRI responses in the V1 LPZ were analyzed and compared across conditions and groups.

Main Results:

  • In both glaucoma and retinitis pigmentosa, fMRI responses in the V1 LPZ shifted from negative during PV to positive during OBT.
  • Healthy controls did not show this shift, indicating it is specific to visual field defects.
  • In glaucoma, significant effects were also observed in V3, suggesting broader cortical involvement.

Conclusions:

  • Task-elicited demands, representing top-down mechanisms, shape LPZ responses in glaucoma and retinitis pigmentosa.
  • The findings suggest a lack of bottom-up plasticity in the human visual cortex for acquired visual field defects.
  • These insights are crucial for developing effective treatments and rehabilitation strategies for glaucoma and similar conditions.