Most Accurate Cataract Surgery (MACS)

Replacement lenses (IOLs)

In Most Accurate Cataract Surgery (MACS), a surgeon called an ophthalmologist removes your cloudy lenses and replaces them with clear artificial ones, called intraocular lenses, or IOLs. There are many lenses on the market, so it can be very confusing to know which is best for you. You and your doctor will determine which best fits your lifestyle and vision needs. Then your doctor will outline all the associated costs and what is covered by your insurance.

Following are the replacement lenses used by MACS surgeons to provide the highest quality visual outcomes:

High-Definition (HD) Bi-Aspheric Quarter-Diopter Lens

It’s a mouthfull to say, but this lens offers several advanced technologies that give you enhanced vision:

HD — a high-definition lens, like an HD TV, provides a higher definition of image clarity. This is largely due to its bi-aspheric technology:

Bi-Aspheric — an aspheric lens improves image quality by reducing the distortion that naturally occurs with a curved lens. This distortion, called spherical aberration, is a major cause of night vision problems, including reduced contrast, halos, glare and the resulting reduced reaction times.

Night Vision (Blurry)
Night Vision (Clear)
This computer simulation mimics vision at night. The first image shows a lens without aspheric correction. The second image shows how aspheric correction improves vision.

Bi-aspheric takes the improvement a step further because it adjusts the optics on both the front and back surfaces of the lens. This helps improve depth of field, as the illustration below demonstrates.

Depth of Field (Negative Aspheric)
Depth of Field (Bi-Aspheric)
This computer simulation shows the difference in depth of field between traditional aspheric lens with negative aspheric power curve (first image) and a bi-aspheric lens (second image), which provides neutral aspheric surfaces and results in greater depth of field focus.

Quarter-Diopter — this means the lens comes in quarter-size increments of power vs. the half-size increments of power available with basic lenses. Think of it like buying shoes. The more size options you have, the better the lens will fit your specific eye shape and size. In fact, studies show that a quarter-diopter lens is 3 times more accurate than a traditional replacement lens.1

20/20 Line (No Diopter)
20/20 Line (Querter Diopter)
20/20 Line (Half Diopter)
This graphic shows the image a patient would see at the 20/20 line on an eye chart with varying replacement lens. At first image is perfectly targeted vision. The second shows vision that is 0.25D (quarter diopter) off, and the last shows vision that is 0.5D (half diopter) off. All will pass the 20/20 vision test, but the best images are at 0 and 0.25D. MACS surgery hits these targets more routinely than traditional cataract surgery.
Loose Zone of Accuracy
Tight Zone of Accuracy
This graphic illustrates how the quarter-diopter lens provides the MACS surgeon with a tighter zone of accuracy when calculating the power for your replacement lens.

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  1. Reference on file with MACS Consortium.
Next: Blended Vision Option