Our Multifocal Lenses

A very special type of rigid gas permeable contact lens. In terms of lens curvature, the lens surface is mostly spherical, meaning that it is just the common everyday simple shape. It is the way these curvatures are arranged which makes the lens unique.

The distance portion of the lens makes up 70% of the total area while the inferior area of the lens is mostly near or reading power. Above this is the very small but necessary intermediate zone which allows the wearer to see between reading and distance zones. These lenses are also prism ballasted which simply means the lens is thicker and has more weight inferiorly for stabilization reasons.

A well hydrated, very comfortable bifocal lens. Based on a modified annular lens principle but rather than having BOTH lenses with the distance portion in the center and the reading at the periphery, these lenses reverse the procedure from one another. In other words, one eye has distance in the center / reading in the periphery while the other is opposite that. The reading is in the center while the distance is now in the periphery.

In the same sense that one uses one hand more than the other, this sytle applies the same principle to the contact lens where one eye is more dominant than the other. The dominant eye is the eye which receives the lens with the distance vision in the middle and the reading portion in the outer region. The other eye adapts to near vision. The beauty of this system lies in the fact that should either your reading or distance not be what is deemed satisfactory, we at CLA can modify either lens to bring the wearer to their maximum acceptable level of vision.

Parameters

The multifocal contact lens is available in powers from + 20.00 to – 20.00 D.for distance and + 1.00 to + 4.00 D. for reading.

This lens is also available with astigmatism corrections.

These designs are a multi-aspheric which means there are different curvatures on the lens as opposed to the spherical design which basically has one curvature. This muti-asphericity is necessary to help the wearer see at many different distances. The counterpart to this lens in eyeglasses is the progressive addition lens which millions are now wearing to deal with Presbyopia. Presbyopia is a condition which results in both men and women over the age of forty-five. As we age, we are unable to accommodate; objects we are looking at closely must be moved further and further away the older we get.

What makes this lens different from other lenses? It is the accommodation zone. The accommodation zone restores natural accommodation by creating a small area of over magnification over the near vision correction needed. In other words, it is stronger in power than the reading add power which enables the wearer to focus clearly on objects previously distorted due to presbyopia. The lens comes in two different near diameters: 1.5 and 1.9 mm. Your eye care professional at CLA will choose the best size for you.