Interactive tool

See the dot the way your eye does

If you have astigmatism, a red dot doesn't look like a clean dot — it smears into a comet or a starburst. Prose can describe that; this tool lets you see it. Drag the severity slider, set your axis, then try the real-world fixes and watch the flare resolve in real time.

Four ways to tame the starburst

Astigmatism bloom isn't a dealbreaker — it's a buying decision. Each of these visibly shrinks the flare in the simulator above:

Switch red → green: Many astigmatic eyes resolve green light more sharply than red, so the starburst reads noticeably tighter.
Choose an etched prism reticle: An etched reticle is reflected ambient light, not an emitter — it physically cannot bloom, so it stays crisp at any severity. The single biggest fix.
Pick a smaller MOA dot: A smaller emitter has less area to flare, so the bloom shrinks with it.
Turn the brightness down: Lower emitter intensity means a smaller, dimmer starburst — the cheapest fix of all.

Optics that fight the starburst

Seen how the fixes work? Here are real, reviewed optics that put them to use:

Vortex Spitfire 3x — an etched prism reticle that runs red or green and can't bloom, exactly the biggest fix above.
Leupold DeltaPoint Pro — an aspheric lens engineered to reduce astigmatic aberration for a crisper dot.

JavaScript is required for the live simulator

The interactive astigmatism render needs JavaScript and WebGL. Here's the short version of what it shows: an emitter red dot smears into a directional starburst as astigmatism increases — and the fixes above (green light, an etched prism reticle, a smaller MOA dot, and lower brightness) each shrink that flare. Enable JavaScript to dial it in for your own eye.