To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The sizing doesn’t make sense. If they were all the length - meaning size of the eye - of the large ones, they would be perfect. I gave it 2 stars because the large ones are nice. The small and medium are a waste of time.