Do these actually block blue light?

They have blue-light filtering lenses built in, so they cut some of the blue part of screen light. The filter is fixed and milder than what dedicated screen-glasses brands offer.

Are they prescription glasses?

They are sold as blue-light glasses, not prescription eyewear. A prescription would have to be added by an optician, and not every lens lab will work with this frame.

They are a full-rim rectangular frame in adult sizing with fixed nose pads. There is no adjustability, so try them on if you have a narrow or wide face.

Are they good for all-day computer work?

They work for desk days and look presentable on video calls. If you are sensitive to weight, a lighter metal screen frame may be more comfortable for eight-hour stretches.

How do they compare with cheaper blue-light glasses?

You pay for the Tom Ford frame and branding rather than stronger lens technology. Plain screen glasses usually cost less and offer more lens options but look less polished.