The standard intraocular lens (IOL) that is used to replace a cataractous lens cannot change focus from distant to near objects, so most patients need glasses for near vision after cataract surgery. Limited evidence suggests that accommodative IOLs provide better near vision than monofocal IOLs, but not better than multifocal IOLs. Long-term follow-up is needed to confirm patient outcomes, and ...

Designing a vision-based autonomous robot that can navigate through complicated outdoor environments is an extremely challenging problem that is far from solved. However, through use of a self-supervised realtime learning strategy and a trained deep belief net for compact feature representations, we have developed a long-range vision system that succeeds in accurately classifying obstacles and ...

26.1. Physics of the Eye • Explain the image formation by the eye. • Explain why peripheral images lack detail and color. • Define refractive indices. • Analyze the accommodation of the eye for distant and near vision. 26.2. Vision Correction • Identify and discuss common vision defects. • Explain nearsightedness and farsightedness corrections. • Explain laser vision correction. 26.3. Color and...

the eyes are organs that detect light and convert it into electro-chemical impulses in neurons. visual perception is the ability to interpret information and surroundings from the effects of visible light reaching the eye. medicine recognizes that altitudes above 1500 meters start to affect humans so that, the eye is very sensitive to restriction of its supply of oxygen. a dimming of vision acc...

There are several methods for presbyopia treatment. Refractive lens exchange (RLE) followed by multifocal intraocular lens (MFIOL) implantation enables high rate of spectacle independence but have some visual disturbances. Laser in Situ Keratomileusis (LASIK) monovision gives patient ability to have good distant vision with dominant eye and good near vision with nondominant eye. In this prospec...

BACKGROUND Profound central-retinal visual losses have been a major presenting factor reported in cancer and melanoma associated retinopathies (CAR, MAR). However, it is well established that standardised tests of peripheral retinal function are often the most sensitive detectors of early eye disease. This is a preliminary investigation of the responsiveness of the peripheral retina to "distant...

The initial image-processing stages of visual cortex are well suited to a local (patchwise) analysis of the viewed scene. But the world's structures extend over space as textures and surfaces, suggesting the need for spatial integration. Most models of contrast vision fall shy of this process because (i) the weak area summation at detection threshold is attributed to probability summation (PS) ...