DQITJ 2 Pcs Dual-use Black Handheld Eye Occluder Plastic Vision Optics Optometry Instrument for Eye Chart Exam (Black)

Exactly what it wanted

Great for vision exam!

Strengthen’s the eye and help with vision

I bought this to periodically check my glasses. If you're looking through this and it appears sharper than what you see with your naked eye or with glasses, it indicates you need lens correction. The magic is all physics, such an awesome tool to determine if you need glasses or an update to your prescription,

I used one of these at my eye doctor's office and it worked great. So I bought this. Not so good. I just punched a hole in a stiff piece of paper and it worked better than this.