Point Spread Function With and Without Scleral Lenses

Below are 2 sets (or slides) of topographical ring and "point spread function images" (PSF) of the same pair of eyes of a patient that underwent both RK and LASIK surgery.

Although you can see the distorted ring images on the photos (slide) on top, what is most interesting are the "point spread function images" (PSF) that can be seen in the upper portions of both sets of images. Look carefully at both the upper and lower sets of PSF images. These images show how a very small beam of light "spreads" after passing through a pair post-surgical (LASIK) corneas and on the same corneas with scleral lenses (lower set of slides). The very small red dot represents a fine beam of light. In the upper set of images, note the white-grey "web-like" patterns around the red beam of light. This represents how light is "spread out" when passing through a distorted post-LASIK cornea. Note how the left PSF image (the image on the right side of the slide) is significantly more distorted than the right PSF image. This is because the left cornea is more distorted than the right cornea. This is why eyeglasses and soft contact lenses cannot provide the post-LASIK distorted cornea with clear, crisp vision. Note the PSF images of same pair of eyes with scleral lenses on the lower set of slides. Note that the small beam of light has virtually no distortion after passing through the scleral lenses. Also note that the ring images in the lower half of the bottom set of slides are perfectly round. Note how the topographical rings in the lower half of the upper set of slides are significantly distorted. Scleral lenses in effect replace the cornea as an optical surface.

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Optimum Infinite Gas Permeable Material

I am happy to announce that our Global Vision Rehabilitation Center will be designing and fitting all of our “high need” patients with the Optimum Infinite gas permeable contact lens material. The Optimum Infinite material is the most oxygen permeable material ever to be approved by the FDA. In addition, this newly FDA approved material includes a UV lens blocker. Now for the first time, with certain patients, wearing a scleral lens made with the Infinite material under extended wear conditions can be considered.

SMAP 3D Scleral Lens Design

NEW: Powerpoint presentation on SMAP 3D

Last year we introduced an exciting piece of technology that has allowed us to custom design a scleral lens much more accurately. It is the SMAP 3D, which is a computer attached to a dedicated camera that allows us to obtain a 3 dimensional image of the entire front surface of the eye, including the cornea and the surrounding white portion of the eye (the sclera). Up until now there has not been any technology that would allow us to measure the ocular curvatures outside the cornea. The SMAP allows us to do this. Read More

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The NEW YORK TIMES on LASIK

Blurred Vision, Burning Eyes: This Is a Lasik Success?

EyePrint Pro

EyePrintPro technology creates a scleral lens based on a mold of the cornea. The molding is accurate to 1 or 2 microns and fits perfectly because it exactly mirrors the irregularities of the individual corneal surface. The technology is well suited for post-Lasik, Keratoconus, RK, eye injury, and corneal transplant patients. Read More in this PDF about EyePrintPro Scleral Lens Technology

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