A simple ruler is enough. I am wearing glasses for 30 years and I had the few pa...

		AdrianB1 on Nov 9, 2022 \| parent \| context \| favorite \| on: Why are glasses so expensive? The industry prefers... A simple ruler is enough. I am wearing glasses for 30 years and I had the few pairs with wrong PD, the next optometrist used a simple ruler and I am working with him for the past 20 years.