Do these tests if you have trouble seeing things at a distance, like a whiteboard or street sign
Snellen Eye Chart Test (credit: Safe Eyes America) (PDF)
Cheap Myopia Glasses (refer to chart below)
Visual Accuity to Prescription Chart
Do these tests if you have trouble reading things, like a textbook
Reading Glasses Test (credit: WarbyParker) (PDF)
Reading glasses can be found at drug stores, supermarkets, and office supply stores
Do these tests if you have any vision problems