Although your eyeglasses correct your vision to 20/20, you may still wish your vision was clearer in certain situations. At Central Valley Eye, we offer high-definition eyeglass lenses that correct for certain vision issues that normal eyeglasses can’t.
Why are my normal eyeglass lenses not always cutting it?
Even if your eyeglasses correct for your predominant vision problem, be it nearsightedness, farsightedness, and astigmatism, you could have other problems still affecting the clarity of your corrected vision. Doctors refer to this as higher-order aberrations.
Higher-order aberrations are more subtle, complex refractive errors, and the technology behind traditional eyeglasses and contact lenses may not be able to correct for them. These higher-order aberrations can cause difficulty seeing at night, glare, halos, blurring, starburst patterns, or even double vision. Every eye has some degree of higher-order aberrations, but often they aren’t enough to cause issues with vision. Abnormal curvature of the cornea and crystalline lens may contribute to the distortion of many higher-order aberrations.
What are high-definition lenses?
You can’t place the blame on the conventional technology used to create the vast majority of eyeglass lenses and contacts. After all, it was invented in the early 20th century! Conventional lenses provide their optimum clarity through the optical center of the lens. As your eye looks away from the center, the clarity of your vision diminishes. This is, even more, the case with high prescriptions and progressive lenses.
Recent advances in lens manufacturing techniques have made possible new high-definition eyeglass lenses that correct for higher-order aberrations. This allows sharper vision across the lens than has been available before. The design of high-definition lenses provide sharper vision in all lighting conditions and reduce glare for nighttime driving and other night vision tasks.
Free-form lenses are the most popular type of high-definition eyeglass lenses. The term “free-form” refers to the advanced manufacturing process that reduces higher-order aberrations such as spherical aberration that occur in traditional eyeglass lenses.
With free-form lenses, computer-controlled surfacing equipment that is much more precise than conventional milling tools is used to create lenses from the wearer’s eyeglass prescription. To show the degree of precision, free-form technology can surface lenses in power increments of 0.01 diopter (D), compared with 0.125 to 0.25 D increments with conventional eyeglass lens tooling.