Vision Simulators: Simulate Your Vision for Friends, Family, Doctors, and Attorneys.

Blurry Vision: In normal, healthy eyes with good vision, blurry vision indicates a need for prescription lens that adds additional power or corrects astigmatism that distorts the natural optics of the eye. Blurred vision can coexist with ghosting, smeared vision, or other visual aberrations.

Extreme Blur Hand Motion Simulator

Ghosted Vision: The term 'ghosting' was coined around 1957, and originally referred to the false image on a TV screen, caused by signal reflection. Ghosts are caused by residual astigmatism, or irregularities in the corneal surface. They vary in terms of transparency, size, and colors ghosted.

Animation Image Set Simulator

Glare: The term 'glare' is sometimes used to refer to the perception of any higher-order aberration. Here, the term is restricted to situations in which light seems to overflow, or 'seep outside,' its normal boundaries around light sources, or sources of reflected light, such as shiny objects.

Indoors Daytime Glare

Halos: Halos are usually huge globes of illuminated fog surrounding sources of light. Sometimes the globes seem to contain other globes, brighter and denser, nested two or more levels deep.

Image Set Simulator

Loss of Contrast Sensitivity: Contrast sensitivity refers to the ability to distinguish between variations of lightness and darkness. Perceptually, this effect is similar to turning down the Contrast on your television or monitor: Eventually sharp boundaries are lost, objects merge together, as if a haze of grey soup had been poured over the visual field.

Image Set Simulator

Starbursting: Starbursting refers to rays or fine filaments coming off lights. At night, these rays can become dramatically longer and denser. Starbursts are highly variable between patients, differing in terms of their size and shape, length of rays, the density of rays, and transparency (whether the light source is visible through the starburst).

Starbursts Types Judging Size Simulator

Retinal Detachment: Information from receptors in the retina is aggregated at the optic nerve, and sent on to the visual cortex for further processing and interpretation. Portions of the retina that are no longer in communication with the brain may result in areas of blankness, blackness. Spatial distortions may exist at the margin of the detachment.

Image Set

Visual Snow: Patients who complain of Visual Snow literally see what resembles "television snow," that is, specs or particles that blink on and off in their vision.


Hemianopia: Hemianopia refers to loss of vision in one half of the visual field of both eyes, most commonly on the right side. Causes of hemianopia include injury to the brain (temporal or occipital lobe) or optic nerve pathways from accident, infection, stroke, or tumor. Hemianopia may also affect the upper or lower halves of the visual field.

Image Set

Visual Quality Disparities: Patients with bilateral eye injury or LASIK complications may report different aberrations in each eye. With both eyes open, these aberrations are synthesized to yield a composite image. However, one eye usually contributes more to the resulting composite than the other, a phenomenon known as "ocular dominance."


Pupil Size: Patients with complications from refractive surgery often report that their vision seems much better in bright light than dim light. Not only does bright light help compensate for Loss of Contrast Sensitivity, it also shrinks the pupil, reducing the visual aberrations caused by an irregular cornea.


My Experience with Scleral Lenses from Dr. Edward Boshnick, by Roger Davis, PhD

In the past 15 years, I've received emails from all over the world thanking me for creating I'm now happy to share my story with scleral lenses. In 1998, I received laser eye surgery from one of the world's top experts. The surgery created double and smeared vision and severe dry eyes. My surgeon was happy with my vision, but I was not. Over the last 18 years, I've seen this story repeated over and over again. So life-altering are these "side-effects" that the FDA's former chief research scientist on Lasik, Dr. Morris Waxler, has a website where he alleges that the industry lied to the FDA about its adverse event rate in order to obtain approval for Lasik. See

In January of 2016, I received scleral lenses from Dr. Edward Boshnick in Miami, FL (see and These lenses have essentially reversed my Lasik, and I now have the same 20/15 to 20/20 vision that I had before my LASIK. Moreover, I have don't have the constant dry eye pain of Lasik. Most of the time I don't even feel the lenses in my eyes.

Scleral lenses are large-sized lenses are made from highly oxygen permeable materials. But scleral lenses are much larger than RGPs. Sclerals vault over the cornea without touching this delicate ocular structure, and instead rest on the white portion (the sclera) of the eye. This is how these lenses get their name. Because the sclera has fewer nerve endings than the cornea, these lenses are very comfortable to wear. The space between the lens and the cornea is filled with saline solution, so that the front of the eye is always kept in a moist environment. This treats vision problems and dry eye at the same time.

Scleral lenses are an ideal lens technology for patients suffering vision loss due to a variety of conditions and diseases such as:

  • Keratoconus
  • Chronic Dry Eyes
  • Corneal transplant surgery
  • LASIK, RK and other refractive surgical procedures
  • Corneal dystrophies and degenerations
  • Pelllucid Marginal Degeneration
  • Highly distorted and irregular corneas
  • Corneas damaged due to trauma

Almost all corneas with any of the above conditions will have severe irregularities. Scleral lenses are an ideal solution for treating these conditions because they are perfectly round and are created from a firm highly oxygen permeable material. In fact, scleral lenses are 5 times more oxygen permeable than any soft contact lens.

In addition, because scleral lenses are rigid, they replace the cornea as an optical surface by creating a smooth, round surface for light to pass through. Almost all of the higher order aberrations or visual distortions seen here can be eliminated or greatly reduced with scleral lenses. This includes glare, halos, flare,starbursts, double and multiple vision etc. Scleral lenses can also be made in virtually any lens prescription.

If you want to functionally reverse your Lasik, your keratoconus, your dry eye, or any other source of corneal irregularity, please call Dr. Edward Boshnick's office at 305.271.8206.


Roger D. Davis, PhD