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Mr. Barker, his bifocals sliding down on his nose, stood at the dais at the front of the House chamber.

"It would be very hard for visually impaired people, or normal people wearing bifocals, to use," he concluded.

Eventually, advocates predict the hearing aid market will resemble eye care, where consumers can choose between drugstore reading glasses or prescription bifocals.

Kyle recognized only one of the projected images—a greenish bald guy wearing bifocals and pants cut off at the knees and tugging on a kite string.

If you already wear corrective lenses of some sort — glasses or contacts — you might consider bifocals or progressive lenses.