3 ms·
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 wit
by AdrianB1 4y ago
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.