Blurry or distorted vision at any distance
Squinting to see clearly
Headaches, especially after reading or screen use
Eye strain or tired eyes
Trouble seeing at night
Glare or halos around lights
Frequent need to change glasses or contact lens prescription
Double vision in one or both eyes
Objects appearing stretched or shadowed
Vision that improves when you close one eye and not the other
An eye exam by an optometrist or ophthalmologist to confirm it