Do these glasses have a prescription?

No. They are non-prescription computer glasses with blue-light filtering lenses. If you need vision correction, you would wear them over contacts or choose a prescription pair instead.

Will they help with eye strain from screens?

They are designed to filter intense blue light and reduce the strain and fatigue of long screen sessions. Results vary by person, and taking screen breaks still matters.

Can I wear them all day?

They are made for extended computer use, and owners report them comfortable for full workdays. The clear-style lenses are meant for indoor screen work rather than outdoor sun.

How do they compare with blue-light coatings on prescription glasses?

These are a standalone pair you can wear without a prescription. A blue-light coating on prescription lenses gives you correction and filtering in one pair, but requires an eye exam and lens order.