Ophthalmic Research Overview

Research Overview

The main activities of Simpson Optics LLC are to do with Research and Development (R&D) relating to lens design, fabrication, and testing. These are discussed on the Home and Consulting pages of this website. 


However, independent research into why some intraocular lens (IOL) patients see peripheral dark shadows led to finding that "far peripheral vision" appears to be a topic that has had very little research. This is the visual region at angles greater than about 60 degrees, off to the side. Calculations for IOL patients indicate that the shadows might be at 80-90 degrees of visual angle, though somewhat surprisingly, after nearly 20 years of reports, the visual angles relating to "negative dysphotopsia" are not really known. The phakic eye (with a natural lens rather than an IOL) is generally thought to see to about 105 degrees or so, but that value is primarily based on a measurement in 1915 by Roenne who measured his own eye, just once. This value seems reasonable from other considerations, but there seem to be no measured data for large patient populations describing how the limiting visual field varies with age or refractive error, or any other parameter. 


This led to research exploring both "negative dysphotopsia" with IOLs, and "far peripheral vision" in general. One conjecture is to wonder whether vision in the far periphery may somehow unexpectedly affect eye growth, which is a primary cause of myopia development, and simple measurements of the limiting visual angle may provide a clue. The early detection of disease is another potential use for the measurement of the limit of vision, and characterization of the ability to detect peripheral motion may lead to new monitoring tools. This is largely unfunded work at the moment, and if anyone would like to collaborate on these topics please make contact.