How does a pair of eyeglasses make it to the silver screen, anyway? What does a director look for? Do the actors have any say?

According to Hollywood optician Cheryl Shuman, whose company - Starry Eyes - has worked on more than 2,500 film projects, it begins with the script. Are there scenes where glasses would create more believability?

For example, a character over 40 would typically wear reading glasses. Or would glasses add to a character's image? For example, Laura Dern's in Jurassic Park, a film based on the best-selling Michael Crichton novel.

Directed by Stephen Spielberg, the film, which also stars Sir Richard Attenborough and Jeff Goldblum, is the story of an eccentric billionaire whose lifelong fascination with dinosaurs leads to the scientific re-creation of the prehistoric animals. Dern plays one of the scientists, and, reports Shuman, Spielberg wanted her to wear glasses that would enhance her portrayal of the character - an intelligent, earthy type.

On the set, Shuman took photos of Dern in a variety of different frames. This page featured some of those photos, all of which were submitted to director Spielberg for selection of the frame that would be used in the film. As of this writing, the final choice had not been made.

Which frame would you choose? Remember, in addition to fitting Dern, the frames have to fit the character she plays - a very intelligent, unselfconsciously attractive scientist.