Observation And Contrast On Stray-Light Caused By Edge Design Of Different Intraocular Lens

ObjectiveTo observe and compare the various stray-light effects caused by several parts of optic edge in 8 intraocular lens(IOL) designed in different type. To discuss impact on dysphotopsia phenomenon in pseudophakic patients after catarct surgery.MethodsRadiation model was found in vitro. Monochromatic laser beam was used to illuminate the upper edge and the complex of IOL between three-piece group and single-piece group at different angles of incidence. Reflected images produced in retinal plane were photographed with a digital camera. The difference of light images were contrasted.ResultsThere were differences in light images between 2 groups, which may be due to different shapes of optic edge design when the upper edge of IOL was illuminated. Three-piece IOL exhibited obvious line images or dense eccentric light patch, which differed with most of IOL in single-piece group when the complex of IOL was illuminated. Moreover, the single-piece IOL TYPE-1C can also produce the dense eccentric light patch as well as a long light streak image.ConclusionThe irregular structure in IOL complex could trigger dramatically light scatter. The existence of edge stray-light may be an important contributor to postoperative glare or other performance of dysphotopsia in pseudophakic patients after catarct surgery.