Flicker Light Stimulation
The use of intermittent light stimuli acts on neuroplasticity and blood circulation. Effects: Flicker stimulation increases retinal blood flow (functional hyperemia), improving the supply of oxygen and nutrients to RGCs. Recent research: Some studies (also on animal models) suggest that flicker at 30 or 40 Hz can modulate glial cell activity (microglia) and promote nerve regeneration or neuron protection.
What studies say (Mechanisms of action)
Optic Nerve Regeneration: Studies published in journals like Investigative Ophthalmology & Visual Science (IOVS) have shown that 40 Hz flicker promotes optic nerve axon regeneration and improves visual function by activating microglia and increasing expression of neural plasticity genes (like BDNF). Neuroprotection: 40 Hz stimulation induces an increase in retinal adenosine, protecting RGCs from stress and cell death. Gamma Entrainment: The stimulus "entrains" visual neurons forcing them to fire synchronously. This improves the transmission efficiency of the "weak" signal from damaged cells.
Duration and Frequency of sessions
The most common research protocols suggest: Duration: 60 minutes a day. Sessions can be divided into two 30-minute parts if visual fatigue is excessive. Frequency: Every day (or at least 5 days a week). Consistency is essential because biochemical benefits require regular stimulation. Period: Initial functional improvements are usually observed after 4-8 weeks of constant treatment.
Distance and Position
Position yourself about 50-90 cm from the screen. Make sure the room is dimly lit to maximize flicker contrast.
Important Warnings
Epilepsy: If you suffer from photosensitive epilepsy, never use flicker stimuli without medical supervision, as they could trigger seizures.
Luminance: To be effective, the stimulus must have high contrast, so make sure your laptop brightness is set correctly, but without causing excessive glare.
Configurazione Sessione
For best results, the screen refresh rate should be a multiple of the chosen frequency.
White Light (Full Spectrum): The most used in clinical trials (like those at MIT) because it activates all types of photoreceptors simultaneously, ensuring maximum electrical stimulation to RGCs.
While using the software, keep these two body signals in mind: "After-image" effect: After the session, it is normal to see light halos or altered colors for a few minutes. It is a sign that the photoreceptors have been intensely stimulated.
Fatigue (Asthenopia): If you experience headaches or eye pain, reduce the screen brightness in the software or shorten the initial sessions.