Double lenses; the top half contains the distance prescription, and the bottom half is the near prescription Most often found in cases of presbyopia or focusing disorders
Eyeglasses incorporating two different powers in each lens, usually for near and distant corrections
spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses
The form bifocal is used as a modifier. Bifocals are glasses with lenses made in two halves. The top part is for looking at things some distance away, and the bottom part is for reading and looking at things that are close. Mrs Bierce wears thick bifocal lenses. special glasses with an upper part made for seeing things that are far away, and a lower part made for reading
Corrective lenses that have two powers of correction Typically the majority of the lens is corrected for distance vision while a small are is corrected for near vision Bifocals and trifocals are normally prescribed for individuals with presbyopia
Eyeglasses that incorporate two different powers in each lens, most of the time for near and distance corrections
Eyeglasses incorporating two different powers in each lens, usually for near and distance vision corrections See Prescription Eyewear in Eye Care Encyclopedia See General Eye Care in Free Eye Tests
Eyeglasses or contact lenses that incorporate two different powers for near and distance corrections