Why is my red dot blurry? Most likely it's caused by the LED emitter red dot starburst or using a red dot with astigmatism.
Here are 5 red dot astigmatism fix you can try to see a much more crisp dot for better aiming.
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Wear Corrected Lens
Most red dot sights on the market today have a clean dot under a digital camera. However, the most practical solution is to get corrected vision. Red dot sight companies that promise a clean dot for users with astigmatism is just a marketing move.