What is Orthóptek?
Orthóptek is a visual stimulation device useful in treating amblyopia and related conditions in both adults and children. The effect can be seen in just 2 sessions of 35 minutes each.
The full course of treatment lasts approximately 3 months — with the first 2 weeks of treatment on consecutive days, then tapering. It is easy to set up and use, even in children as young as 4 years old.
Setting Up Orthóptek
The following images illustrate the straightforward setup and use of the Orthóptek device.
Cortical Aspects of Vision
Amblyopia is fundamentally a cortical deficit. Key questions include whether V1 is the primary problem, whether the deficit is functional or structural, and whether extrastriate areas are more affected than V1.
Research confirms that cortical processing deficit in amblyopia is extensive, involving large regions of extrastriate cortex beyond V1. The primary problem is in glutamate metabolism in V1.
Amblyopia — The Cortex
The Cortical Deficit
- Is V1 the primary problem?
- Is it functional or structural?
- Are extrastriate areas worse than V1 deficit?
Cortical processing deficit in amblyopia is extensive, involving large regions of extrastriate cortex besides V1.
Primary Problem: Glutamate Metabolism in V1
The synaptic transmission at 4C Beta in the occipital cortex involves glutamate as the primary neurotransmitter. Disruption of NMDA receptor signaling — influenced by top-down impulses from parietal and frontal eye field areas — underlies the amblyopic deficit.
Synaptic Transmission at 4C Beta
The Pathway
Glutamate is the primary neurotransmitter at the 4C Beta layer of the occipital cortex. The NMDA receptor plays a central role in synaptic transmission, modulated by top-down impulses from the parietal lobe and Frontal Eye Field Area (FEFA).
Retina
Sends input to presynaptic membrane
NMDA Receptor
Activated by glutamate release
Top-Down Impulses
From FEFA and parietal lobe modulate 4C Beta
Visual Processing Pathway
The complete visual processing pathway integrates bottom-up sensory signals with top-down cognitive control, spanning from retinal ganglion cells to the saccadic generation center.
Interconnections of the Eye with the Brain
Vision involves a rich network of cortical regions working in concert — from the occipital cortex to the frontal eye fields, posterior parietal cortex, and saccadic generation centers. These interconnections explain why amblyopia is a cortical, not merely an optical, problem.
Frontal Eye Field
Motor planning & voluntary saccades
Posterior Parietal Cortex
Attention & spatial awareness
Superior Colliculus
Reflexive eye movements
Temporal Cortex
"What of Vision" — object recognition
Invented & Developed by Dr. K. S. Santhan Gopal, MD (AIIMS), FRCS(Edin) | Ophthalmologist | Former President AIOS