A lens is not built up.
It is reduced down — to only what is necessary.
Every material, curve, and edge exists to remove something: weight, distortion, thickness. What follows is the reasoning behind that reduction, not a list of features.
READ ONIt starts with how densely a material can bend light.
Every lens material has a refractive index — a measure of how sharply it bends light as it passes through. The higher the index, the less material is needed to achieve the same correction.
Tokai's proprietary material sits at 1.76 — the highest refractive index available in a plastic lens anywhere in the world. It's not a coating or a design trick. It's the raw physical property everything else in a Tokai lens is built on top of.
Most lenses calculate one surface. Tokai calculates both.
A standard lens is ground on one side and left spherical on the other. Tokai's double-sided aspheric design calculates the curvature of both surfaces together — which flattens the overall profile of the lens and reduces the distortion and edge magnification that shows up in stronger prescriptions.
The practical result is a lens that looks closer to flat glass, even at prescriptions where that's traditionally difficult to achieve.
What's left at the edge is ground down further, then polished.
Higher prescriptions leave a thicker ring of material at the outer edge of the lens — the part sitting inside your frame. Tokai's Fine Edge Processing removes more of that unused material and polishes the result, without touching the optical center you actually look through.
The two factors compound: a higher-index material starts thinner, then finishing reduces the edge further still.
VS. A STANDARD 1.50 INDEX LENS
Checked against Tokai's own tolerance, not the industry minimum.
Every lens is surfaced and inspected in-house in Okazaki before it ships — measured against standards Tokai sets for itself. Four generations of the same independent, family-owned manufacturer have kept that standard in place since 1939.
What Tokai Is Actually Known For
Two lens designs, three finishing technologies — each solving a specific problem, not a full catalogue.
MyoGen
A myopia control lens for children built around a honeycomb structure of roughly 1,330 hexagonal micro-lenslets surrounding a clear central vision zone — redirecting peripheral light to help reduce the eye elongation that drives myopia progression. Backed by a published randomized clinical trial.
Best for: children with a progressing prescription, or a family history of myopia
Neuro Select
A progressive lens designed using actual brainwave data — measuring how the brain perceives clarity across the visual field to shape a wider, more natural zone of comfortable vision.
Best for: progressive wearers who want a shorter, easier adjustment
No Reflection Coating (NRC)
Tokai's flagship anti-reflective coating — reflection reduced to a fraction of a standard AR coating, so the lens reads as close to invisible as possible. Eyes stay clearly visible on video calls, in photos, and under studio light.
Best for: anyone who wants the clearest, most natural-looking finish
Night Drive
Filters the specific glare produced by modern LED and xenon headlights, and improves contrast in low light — built for the eyes, not just the lens.
Best for: frequent night driving
Defog (DFC)
A maintenance-free anti-fog coating — no spray, no wipe, no reapplying. Built to stay effective through humidity, masks, and temperature swings between indoors and out.
Best for: anyone whose glasses fog up more than they'd like~1,330 HEXAGONAL SEGMENTS SURROUNDING A CLEAR CENTRAL ZONE
A Starting Point
A general guide only — a precise recommendation follows an eye examination and a discussion of your prescription.
See The Process
Before You Decide
An initial examination establishes how the prescription is tracking. Where it continues to change, MyoGen is worth discussing — its honeycomb micro-lens structure is designed to help slow progression while still giving clear central vision for everyday use.
They solve different problems. NRC reduces reflection off the lens surface generally, which helps in most everyday lighting. Night Drive goes further specifically for the wavelengths produced by modern LED and xenon headlights — the two are often paired together for people who drive frequently after dark.
Not necessarily — the benefit scales with how strong your prescription is. For mild prescriptions, a standard lens may already be thin enough that 1.76 makes little visible difference. We'll show you your actual prescription at each index before you decide.
No — it only reshapes the unused outer edge of the lens that sits inside the frame. The optical part you look through is untouched.
No — Tokai lenses fit into most frames, including ones you already own. Smaller, tighter shapes tend to show the thinness advantage most clearly.
It depends on your prescription, chosen lens, and coatings, so it's different for everyone. Message us or come in and we'll give you exact numbers for your needs.
Speak with an optician before you decide.
Every prescription is different — we'd rather show you the exact thickness and pricing in person than guess online.
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