Vision Adaptive Display Technology

Your screen,
calibrated
for your eyes.

4Eyes reads your eye prescription and instantly adapts brightness, contrast, letter spacing, font weight, and more across every website — so every screen feels like it was designed just for you.

⬇ Download Free See how it works
3
Platforms Supported
6
Prescription Fields
<1s
Real-Time Response
∞
Websites Adapted
How it works

Three steps to
perfect vision comfort.

No configuration required. No eye tests needed. Just your prescription and 4Eyes does the rest.

01
Enter your prescription
Type in your SPH, CYL, Axis, and ADD values for each eye. 4Eyes detects your condition type and calibrates instantly as you type.
02
Watch your display adapt
Brightness, contrast, letter spacing, line height, and font weight all adjust automatically in real time — no button press needed.
03
Browse comfortably
The Chrome extension applies your settings to every website you visit. 4Eyes runs silently, always protecting your eyes.
04
Fine-tune anytime
Manual override sliders let you adjust settings beyond your prescription whenever you want. You're always in control.
Right SPH
-2.25
Left SPH
-1.75
Right CYL
-0.50
Axis
090°
Features

Built for real eyes.
Not just dark mode.

Every feature in 4Eyes is designed around actual vision science, not just aesthetic preference.

👁
Prescription-Based Calibration
Enter your full eye prescription including SPH, CYL, Axis, and ADD. 4Eyes calculates the optimal display settings for your unique vision profile.
⚡
Real-Time Adjustment
Display settings update as you type your prescription — no buttons, no waiting. See the difference instantly on every element of your screen.
🌐
Chrome Extension
The 4Eyes Chrome extension applies your prescription settings to every website you visit — contrast, spacing, font weight, and line height across the entire web.
🔤
Smart Font Recommendations
4Eyes recommends the best fonts for your prescription type — Atkinson Hyperlegible for myopia, Lexend for astigmatism, Nunito for hyperopia, and Source Serif 4 for presbyopia.
🔬
Astigmatism Intelligence
4Eyes detects your astigmatism type from your axis value — horizontal, vertical, or oblique — and applies the precise adjustments that make text sharper for your eyes.
⚖️
Font Weight Adjustment
Automatically adjusts font weight across every website — bolder text for myopia to improve character clarity, lighter weight for hyperopia to reduce visual strain.
New Feature

Your lenses are distorting
your screen. We fix that.

Blue light blocking, UV, and photochromic lenses all introduce subtle color distortion. 4Eyes detects your coating type and corrects the shift — so your screen looks exactly as it should, even through your lenses.

🔵
Blue Light Blocking
Blue light blocking coatings add a yellow tint to your screen. 4Eyes applies a cool tone correction to restore accurate colors.
☀️
UV Coating
UV protective coatings can introduce a subtle color shift. 4Eyes compensates with a precision brightness and saturation adjustment.
🌗
Photochromic / Transition
Transition lenses darken based on light exposure. 4Eyes adjusts screen brightness based on time of day to complement your lens state.
👓
No Coating
Standard lenses with no special coating. 4Eyes focuses purely on prescription-based display calibration for maximum comfort.
Get 4Eyes Free

Start seeing better today.

Download 4Eyes for your platform and install the Chrome extension.
Setup takes less than 2 minutes.

🍎 Download for Mac 🪟 Download for Windows 🐧 Download for Linux
✓ macOS 12+ ✓ Windows 10/11 ✓ Ubuntu / Debian

Also install the Chrome Extension → to apply your settings to every website.