The Internet is enticing a rapidly growing number of shoppers to make a very personal purchase, prescription eyeglasses, online.

Customers can’t pluck a pair of glasses from their smartphone screen to learn how they feel, but shoppers can try on frames virtually or have them delivered for a free test. They also can quickly scroll through hundreds of choices and send pictures to friends for a second-opinion.

Technology, however, hasn’t erased all the advantages of buying glasses in a store. Here are some issues to consider before clicking on a pair of glasses and adding them to your virtual shopping cart.

What are some options for buying eyeglasses online?

A mix of websites sells eyewear in men’s and women’s styles, with some featuring well-known brands such as Oakley and Gucci. They include established vendors like and and more recent entrants like Warby Parker.

These sites let customers scroll through hundreds of options and styles in different colors. Some, like, allow visitors to upload pictures so they can see how a pair of glasses would look on their face.

Retailer 1-800-Contacts will offer a three-dimensional version of this concept soon, when it launches a free app that enables users to virtually try on glasses after taking a picture of their face with a smartphone or tablet.

The app will produce an image that is scaled so the glasses appear more like they would if the customer picked them off a store shelf.

What are the advantages of shopping online?

Virtual vendors can offer page after page of variety., which dates back to 1996, says on its website that it carries more than 100,000 products and 500 brands.

Bargains also can be found online. The website features glasses that sell for $39. That price includes single-vision lenses and the frame.

Warby Parker advertises prescription glasses starting at $95. The company developed its own styles for men’s and women’s glasses, plus a monocle it sells for $50, in part because its founders thought prescription eyewear shouldn’t cost $300 or more.

Of course, bargains are not limited to online vendors. Some Wal-Mart stores offer prescription, single-vision lenses that start at $29.

What are the limitations?

Store visits connect customers with eyewear experts who can walk them through a purchase.

For instance, if customers wants rimless glasses, a store employee might point out that the lenses may be thicker than they anticipate to support the frame and could be uncomfortable to wear, said Sam Pierce, a trustee with the American Optometric Association. The employee also could tell a customer whether his or her prescription would fit properly in the style they want or whether the frame may be too big or too small.

The initial cost for glasses advertised on a website may be a bargain, but extra fees for a strong prescription or tinted lenses can add to the bill. Traditional eyewear stores also can bump up the amount a customer spends by pushing features like anti-smudge protection.

Some online companies also may charge shipping fees. Know the extra costs that come with a pair of glasses before buying.

Online shoppers also may want to do a little research on their vendor before buying glasses, since the customer can’t simply drive to the store to talk to someone if a problem arises. Find out how the vendor handles adjustments to a prescription or returns. Some sites offer money-back guarantees on returns if the glasses are sent back within a certain time frame.