Bifocal lenses contain two primary corrective powers in one eyeglass lens. The upper portion is usually used for distance vision, while a lower segment provides additional plus power for near tasks such as reading. Traditional bifocals have a visible line separating the two zones.
Bifocals are commonly used for presbyopia, the age-related decline in near focusing ability. They can also be prescribed for specific binocular or accommodative needs at the clinician’s discretion. The near addition power is determined by the eye examination and the wearer’s working distance.
Different segment shapes can change how much near viewing area is available and how the lens looks cosmetically. Common styles include flat-top or D-segment bifocals, round segments and blended designs. Eye Gallery’s current spectacle-lens page lists Flat Top 28, Round 22 and blended bifocal options.
Bifocals provide a clear, distinct jump from distance to near. Progressives create a gradual change through distance, intermediate and near without a visible line. Bifocals may offer a wider near segment for some wearers, while progressives provide intermediate correction and a no-line appearance.
Because the near segment adds prism at the segment boundary, some bifocal designs create a noticeable shift in image position when the eyes cross the line into the near segment. Wearers often adapt to this quickly, but the effect is different from the peripheral distortion associated with progressives.
The near segment must be positioned so it is available when the wearer looks down for reading without interfering excessively with distance vision. Accurate frame fit and segment-height measurement are therefore important. A frame that repeatedly slides down can change how the wearer accesses the segment.
Bifocal lenses combine distance and near powers in one lens, usually with a visible segment line. They are a proven way to correct presbyopia and may be preferred by people who want distinct viewing zones rather than the gradual corridor of progressive lenses.
Need help choosing eyewear or contact lenses? Contact Eye Gallery by Garen Oganni at its Beverly Hills location to ask about current products, optical services and appointment availability. For medical concerns, request evaluation by the appropriate licensed eye care professional.
Are bifocals only for older adults?
They are most commonly used for presbyopia, which develops with age, but bifocals can also be prescribed for other clinical reasons.
Do bifocals have a visible line?
Traditional bifocals do. Blended designs can make the boundary less obvious, although optical behavior still differs from a true progressive lens.
Do bifocals include computer distance?
Standard bifocals mainly provide distance and near. A computer may fall between those ranges, so some wearers need a different design for prolonged intermediate work.
Are bifocals easier to adapt to than progressives?
Some people prefer the clear separation of zones, while others prefer the continuous range of a progressive. Adaptation is individual.
Does Eye Gallery carry bifocals?
The current spectacle-lens page lists several bifocal options. Confirm current availability and suitability for your prescription before ordering.
