00LightCinematic opening
Light is more than what we see.
Every photon begins a biological journey: through the retina, along neural pathways and into the networks involved in how we experience light.
01RetinaInside the retina
The eye detects. The brain interprets.
Three systems. Interconnected responses.
Scroll sequence · select a type to explore
- Rods
- Vision under low-light conditions.
- Cones
- Colour and detailed visual perception.
- ipRGCs
- Melanopsin-expressing retinal neurons involved in non-image-forming light responses, with connections to several brain pathways.
Automatic sequence: rods, cones, then ipRGCs.
Educational schematic of retinal cell types. Proportions are not to scale.
02PathwaysFrom retina to brain
Light does not stop at the retina.
Image-forming visual pathway
01Rods and cones signal through bipolar cells to retinal ganglion cells, the output neurons of the eye.
Read the full pathway
Image-forming visual pathway
Rods and cones feed retinal ganglion cells whose axons form the optic nerve. Nasal fibres cross at the optic chiasm, so each optic tract carries the opposite half of the visual field to the lateral geniculate nucleus, and the optic radiation delivers it to the primary visual cortex along the calcarine sulcus. This is the route that builds the image you see.
Caution Educational schematic: proportions and positions are approximate. The exact proportion of crossing fibres and the size of V1 vary considerably between individuals.
03ExperienceTypical processing versus photophobia
The same light. A different experience.
Photophobia is more than light intensity. Visual, sensory and pain-related neural pathways may interact.
Typical light processing
- Rods and cones drive vision through the lateral geniculate nucleus to V1.
- Melanopsin ganglion cells (ipRGCs), which also receive rod and cone input, signal brightness to the suprachiasmatic nucleus and the pretectum.
- Signal amplitude here is illustrative only; nothing represents a measurement of any brain.
Mechanism notes
Typical light processing
Calm, low-amplitude illustrative signalling along established routes.
Light reaches the brain through more than one route. Rods and cones build the image through the lateral geniculate nucleus and primary visual cortex, while melanopsin ganglion cells signal overall brightness to the circadian clock and the pupil reflex. In this mode the illustration keeps every signal calm and low in amplitude, with clear pathway labels.
Overcast daylightconceptual
Soft, diffuse daylight, conceptually. Cones take over vision and melanopsin cells begin to report overall brightness. Emphasis moves toward the image-forming and circadian routes.
Conceptual illustration only. Not a clinical sensitivity test, a physiological model or a representation of any patient's neural response. Screen brightness is held nearly constant by design.
04AtlasThe neurology of light sensitivity
One symptom. Multiple possible mechanisms.
Some light sensitivity arises mainly in neural processing, some at the ocular surface or inside the eye, and some is mixed. The atlas marks each.
Select a condition
Choose one of the seven conditions to see where its light sensitivity is thought to arise, which structures light up in the schematic, and what is known versus still under investigation.
Atlas cautions (3)
Not a diagnostic tool. Light sensitivity is a symptom shared by many conditions, several of them urgent, and in one clinic series a quarter of patients left without a documented cause. The atlas explains proposed mechanisms; it does not identify anyone's condition.
Visual snow is distinct from migraine aura: different time course, imaging signature and treatment response.
Photosensitive epilepsy is not photophobia: it is light- or pattern-triggered seizures via occipital hyperexcitability, whereas photophobia is light-evoked discomfort or pain. The two are never merged here.
05SpectrumThe optical engineering opportunity
What if we could engineer the spectrum itself?
Scene: light from a dissolving brain re-forms as a 380 to 700 nanometre spectrum band with wavelength marks at 380, 450, 500, 550, 600, 650, 700 nanometres. A smoke grey explorer lens slides in front of it. With the lens inserted the whole spectrum dims to roughly a quarter of its brightness, the 460 to 490 and 585 to 600 nanometre regions dim further, 520 to 560 nanometres keeps a small relative peak, and the red end stays brightest.
Design-target bands
Values recited in the granted patent claims and specification; not independent measurement.
Band shows the transmitted result through the illustrative curve
The lens acts on light only, not on neurons or on the mechanisms of any condition.
Spectral transmittance chart. Illustrative curve shaped to the band-averaged values in granted Indian Patent 587746 (FIG. 3, Table 2); not a spectrophotometer trace. Wavelength 380 to 700 nanometres on the horizontal axis, transmittance 0 to 100 percent on the vertical axis. 460 to 490 nm attenuated, 83 ± 2 percent (granted claim 1), mean 17 percent; 520 to 560 nm green comfort band, 23 to 25 percent transmission peak (granted claim 1), mean 24 percent; 585 to 600 nm attenuated, 78 ± 2 percent (granted claim 1), mean 22 percent. Use the left and right arrow keys to move the wavelength cursor by one nanometre, Shift with an arrow for ten, Home and End for the ends of the range, Enter or Space to select or deselect the band under the cursor, Escape to clear.
| Band | Role | Mean transmittance (percent) |
|---|---|---|
| 460 to 490 nm | Attenuated, 83 ± 2 percent (granted claim 1) | 17 |
| 520 to 560 nm | Green comfort band, 23 to 25 percent transmission peak (granted claim 1) | 24 |
| 585 to 600 nm | Attenuated, 78 ± 2 percent (granted claim 1) | 22 |
Smoke grey tint, overall visible light transmission about 21 to 25 percent (patentee's figures; EN ISO 12312-1 Filter Category 2). Not suitable for driving in twilight or at night.
How to read this chart
Reading the chart: a clear lens would sit near 90 percent across the visible range. NeuroCalm FLX+ is a smoke grey tint, so its curve sits near 21 to 25 percent through most of the visible range, dips to about 17 percent at 460 to 490 nm and about 22 percent at 585 to 600 nm, holds a small peak of 23 to 25 percent at 520 to 560 nm, and rises only in the red. The depth of a dip shows how much is removed; its width shows selectivity.
Biology for context, not a lens property
Melanopsin, the photopigment of intrinsically photosensitive retinal ganglion cells, is most sensitive near 480 nm in vitro (human melanopsin peak about 479 nm). Measured at the cornea, the CIE S 026 melanopic action spectrum peaks near 490 nm, because the eye's own media filter short wavelengths before light reaches the retina.
The curve is an illustration shaped to the band-averaged values the granted specification reports (FIG. 3 bins, Table 2 spot values, claims 1 and 3): about 1 percent below 400 nm, 17 percent at 460 to 490 nm, a 23 to 25 percent peak at 520 to 560 nm, 22 percent at 585 to 600 nm, rising to about 47 percent in the red. The shape between those points is interpolated. It is not a spectrophotometer trace of NeuroCalm FLX+, and no percentage read from it is an independent measurement.
06NeuroCalm FLX+An Indian-granted optical invention
Introducing
NeuroCalm FLX+™
Patented dual-band wavelength-selective optical engineering.
- Indian patent no.
- 587746
- Application no.
- 202521094370
- Inventor
- Surajkumar Arunkumar Dubey (Suraj Dubey)
- Patentee
- Sleepaxa Private Limited
- R&D
- Acieon Labs
- Status
- Granted 27 April 2026, 10 claims
“An optical lens with dual-band selective light attenuation”
Verify on the Indian Patent Office register(manual search)
Patent filings and grants describe intellectual property protection. They do not by themselves represent clinical approval, medical-device clearance, diagnosis, treatment, or cure claims.
- 460 to 490 nm, 83 percent attenuated
- 520 to 560 nm, 23 to 25 percent peak kept
- 585 to 600 nm, 78 percent attenuated
07AccessIndian-granted patented dual-band optical technology
Built on optical science. Experienced in person.
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The science
Spectral physics, human visual pathways and the published research on light sensitivity.
Revisit the scienceIII
For professionals
Request technical documentation or express interest in a dispensing partnership.
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Discover verified participating locations as the network is published.
Participating locations will be published here as the partner network is verified. No addresses are listed until each location is confirmed.
NeuroCalm FLX+™
An optical innovation by Acieon Labs / Sleepaxa Private Limited.
Educational content, not medical advice. A granted patent is not a certification of clinical efficacy. .