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Most people who wear glasses or even know someone who wears glasses have probably heard of bifocals before. Bifocals enable the wearer to have two prescriptions within the one lens so they can see clearly up close and at regular distance.
A term that many people probably haven't heard is trifocals. Like the name suggests, trifocals are eyeglasses that have three prescriptions within the one lens. Trifocals aren't used by the majority of the glasses wearing population, and are typically prescribed for advanced presbyopia. Presbyopia is a word that refers to a normal loss of vision that's associated with aging. As the condition begins to worsen, trifocals may be prescribed to essentially kill three birds with one stone. Three separate corrective prescriptions are within the one pair of glasses.
A standard pair of trifocals will be instantly noticeable to anyone who's paying attention because they'll have three distinct horizontal lines on each lens. A different prescription will reside in each specific section, and enable the wearer to see clearly at three different distances. If you wear trifocals but don't want the lines on the lenses, you can opt for progressive lenses which have the same features as normal trifocals without the lines. Progressive trifocal lenses may also be called graduated lenses, progressive power lenses or varifocal lenses. Progressive lenses work well for people who might find the lines distracting or who don't want to broadcast to the world that they're wearing trifocals.
In a standard pair of trifocal glasses, the prescriptions for near and mid range correction are usually contained in a section near the bottom of the lens that resembles a semi-circle. The near range prescription is set closest to the bottom of the lens and is used when the wearer must read something up close or do some other detailed work such as sewing. The mid range part of the correction is set near the middle of the lens. This prescription is used when the wearer needs to focus on an object that's about an arm's length away. The mid range correction section of the glasses is usually thinner than the others but it can be altered if you use the trifocals for a lot of mid range work like using a computer.
Anything that's outside of an arm's length away will require the wearer to use the upper most part of the lens. This top section might contain a prescription to help combat another condition like nearsightedness or farsightedness, as well. Trifocals are glasses that work well for people with various hobbies that require a lot of switching focus, or with activities like driving. When you drive, you may need to focus on dashboard instruments one second, then read a sign in the distance the next. You aren't likely to find trifocals anyplace that sells discount glasses or cheap eyeglasses but you can still shop around for the best price if you need them. Ask your eye doctor to recommend a good supplier so you can find a good pair of cheap eyeglasses and stay within your budget.
A term that many people probably haven't heard is trifocals. Like the name suggests, trifocals are eyeglasses that have three prescriptions within the one lens. Trifocals aren't used by the majority of the glasses wearing population, and are typically prescribed for advanced presbyopia. Presbyopia is a word that refers to a normal loss of vision that's associated with aging. As the condition begins to worsen, trifocals may be prescribed to essentially kill three birds with one stone. Three separate corrective prescriptions are within the one pair of glasses.
A standard pair of trifocals will be instantly noticeable to anyone who's paying attention because they'll have three distinct horizontal lines on each lens. A different prescription will reside in each specific section, and enable the wearer to see clearly at three different distances. If you wear trifocals but don't want the lines on the lenses, you can opt for progressive lenses which have the same features as normal trifocals without the lines. Progressive trifocal lenses may also be called graduated lenses, progressive power lenses or varifocal lenses. Progressive lenses work well for people who might find the lines distracting or who don't want to broadcast to the world that they're wearing trifocals.
In a standard pair of trifocal glasses, the prescriptions for near and mid range correction are usually contained in a section near the bottom of the lens that resembles a semi-circle. The near range prescription is set closest to the bottom of the lens and is used when the wearer must read something up close or do some other detailed work such as sewing. The mid range part of the correction is set near the middle of the lens. This prescription is used when the wearer needs to focus on an object that's about an arm's length away. The mid range correction section of the glasses is usually thinner than the others but it can be altered if you use the trifocals for a lot of mid range work like using a computer.
Anything that's outside of an arm's length away will require the wearer to use the upper most part of the lens. This top section might contain a prescription to help combat another condition like nearsightedness or farsightedness, as well. Trifocals are glasses that work well for people with various hobbies that require a lot of switching focus, or with activities like driving. When you drive, you may need to focus on dashboard instruments one second, then read a sign in the distance the next. You aren't likely to find trifocals anyplace that sells discount glasses or cheap eyeglasses but you can still shop around for the best price if you need them. Ask your eye doctor to recommend a good supplier so you can find a good pair of cheap eyeglasses and stay within your budget.
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