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Contact lenses are available for those who require different prescriptions for correcting distance vision as well as near vision. This condition is called presbyopia. The lenses often have one prescription on half of the lens and the other prescription on the other half of the lens. The prescriptions may switch abruptly or have a transitional section where the two prescriptions are blended. In the case of bifocal contact lenses the eye must learn to determine which prescription is required for viewing an object that is either near or far.