Not all eye tests are equal. There are three things you might want: 1. Measure my prescription so I can buy the right glasses 2. All the above, but also check

Not all eye tests are equal. There are three things you might want: 1. Measure my prescription so I can buy the right glasses 2. All the above, but also check the health of my eyes with analogue tools (by a qualified optician/optometrist) 3. Check the health of my eyes with more advanced digital tools. #1 is easy to get in developing countries, and often free. I once had an eye test of this type at a market stall in Beijing. #2 is what you get in the UK for $0 to $30. Optical stores make their money on glasses and contact lenses, so they are happy to sell these tests at or below cost. I had my first US eye test recently. Even with insurance, I paid $20 out of pocket for #2, and and $65 out of pocket for #3. I'm not sure how much #2 would cost in the US without insurance, but I guess it's much more than in the UK.