The eye doctor business has taken to heart, The late Herman Snellen's acuity chart. Working down line by line from that Capital E, The doctor could tell just how well we could see.

Need new glasses? Online eye exams and vision tests offer a convenient way to get a glasses prescription. Doctors explain whether these services are worth trying.

Find out the differences between vision screening and an eye examination. Learn the procedure, benefits, and why they're essential for eye and vision health.

The basic concept remains the same regardless of platform: You take a read-the-eye-chart test at home, and an eye doctor reviews your results to determine if your current prescription is still OK.