Changes in your vision can occur as part of getting older. After 40, you may have to consider using trifocal lenses to be able to see clearly regardless of how near or far the object is. Even if you already have prescription glasses, trifocal lenses will help you see more clearly, especially if you have presbyopia, which happens when your eyes have lost its ability to naturally change its focus due to age. These lenses are a type of multifocal lenses, which have more lens power for better vision.
Trifocals have three lens powers, thus, three points of focus: one for distance, another for near vision, and the third for intermediate vision. The intermediate part is located directly above near seg and designed for viewing anything at arm’s length. Trifocals are fitted a little higher than bifocals. The intermediate seg’s top line is placed evenly with the pupil’s lower margin. During fitting, you will have to look through the intermediate area and focus on an item that is 18 to 24 inches away. Your eyes should gravitate straight ahead, or over and up the multifocal segments when looking at something that is distant.
The intermediate segment in trifocal lenses provide 50 percent of additional magnifying power of the near segment, so you can see well when using the computer or when driving (i.e. when you have to view the dashboard gauges and speedometer). Trifocals can be helpful if your depth of focus is lesser than it should. Most trifocal lenses have a flat-top design with their intermediate and near segments at 28mm wide. Trifocals may look odd to some people, while others are worried that they might not get used to it. However, most people who have tried them are reportedly pleased with the aid in their rage of vision and the wide field of view they can achieve when using the computer.
Trifocal lenses apply to lens implants, too. This time, it may eliminate the need to wear glasses all the time. Trifocal toric lenses are aimed at individuals with high astigmatism levels. Zeiss and Physiol make those lenses, and they will be crafted for you from scratch. These lenses can be implanted during lens replacement surgery or laser cataract surgery.
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