1. Number of prescriptions

• Single Vision: The entire lens has one fixed prescription.
• Multi-Focal (Progressive): The lens has multiple prescriptions that change gradually from top to bottom.

2. Vision coverage

• Single Vision: Corrects only one distance — either far away or up close.
   
  Clear for distance → blurry for near, and the other way around.
• Multi-Focal (Progressive): One pair works for distance, intermediate, and near vision at the same time.
   
  Good for walking, using a phone, computer, and daily use.

3. Comfort & convenience

• Single Vision: You need to switch or take off your glasses for different distances.
   
  Inexpensive and easy to get used to.
• Multi-Focal (Progressive): No need to take them off — more convenient.
   
  Requires a few days to adapt.

In short

• Choose single vision if you only need to correct one vision issue.
• Choose multi-focal (progressive) if you want one pair for all distances
   
  (especially if you have both myopia and presbyopia).

https://scoolglasses.com/products/cat-eye-glasses-wr-87055