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.

You can't get a full online eye exam, but turning to online services is a hassle-free way to renew a glasses or contacts prescription.

Eye doctor Herman Snellen (Dutch, 1834–1908) developed the most commonly used eye chart in the 1860s. The now iconic Snellen chart contains 11 rows of capital letters decreasing in size as the eye ...