The middle layer between the retina and sclera is called the choroid. The choroid contains blood vessels that supply the retina with nutrients and oxygen and remove its waste products. [Image Gallery: Eye Implant Restores Some Vision to Blind]

The interior chamber of the eyeball is filled with a jelly-like tissue called the vitreous humor. After passing through the lens, light must travel through this humor before striking the sensitive layer of cells called the retina.

Feb. 20, 2024 - Norton Shores, Mich. - Smart Vision Lights (SVL), a global leader in the design and manufacture of innovative LED illumination solutions, introduces the LHI-DO Lightgistics series light, which is available in 300 mm and 600 mm models designed to deliver intense linear light in high-speed scan tunnel systems. Equipped with Hidden Strobe technology, the light delivers the benefits of LED strobing while minimizing the disruption and disorientation associated with bright, pulsing lights. Hidden Strobe technology enables LEDs to rapidly self-trigger thousands of times per second at rates imperceivable to the human eye—giving off an illusion of continuous illumination. The novel technology helps logistics companies maximize the capabilities of machine vision systems while protecting employees against the harmful and disorienting effects of continuous flashing lights. “High-speed machine vision systems often use pulsating LEDs to capture images of objects moving at rapid speeds, but without a shield, the strobing can be disorienting and distracting for nearby workers,” said Steve Kinney, director of training, compliance and technical solutions at Smart Vision Lights. “Machine vision lights such as the LHI-DO leverage Hidden Strobe technology to remove this nuisance and allow the machine vision system to safely and effectively leverage strobed LEDs for challenging high-speed applications.”

Feb. 20, 2024 - Norton Shores, Mich. - Smart Vision Lights (SVL), a global leader in the design and manufacture of innovative LED illumination solutions, introduces the LHI-DO Lightgistics series light, which is available in 300 mm and 600 mm models designed to deliver intense linear light in high-speed scan tunnel systems. Equipped with Hidden Strobe technology, the light delivers the benefits of LED strobing while minimizing the disruption and disorientation associated with bright, pulsing lights. Hidden Strobe technology enables LEDs to rapidly self-trigger thousands of times per second at rates imperceivable to the human eye—giving off an illusion of continuous illumination. The novel technology helps logistics companies maximize the capabilities of machine vision systems while protecting employees against the harmful and disorienting effects of continuous flashing lights. “High-speed machine vision systems often use pulsating LEDs to capture images of objects moving at rapid speeds, but without a shield, the strobing can be disorienting and distracting for nearby workers,” said Steve Kinney, director of training, compliance and technical solutions at Smart Vision Lights. “Machine vision lights such as the LHI-DO leverage Hidden Strobe technology to remove this nuisance and allow the machine vision system to safely and effectively leverage strobed LEDs for challenging high-speed applications.” Lighting the way for improved track-and-trace Machine vision systems attempting to perform accurate high-speed barcode scanning or optical character recognition (OCR) on packages with reflective plastic wraps or shipping bags run into significant issues with glare. Polarizers can overcome the glare problem, but this comes at a cost, with reduced light output and decreased clarity. Lightigistics lights featuring Dual OverDrive technology are designed specifically to overcome these issues. Dual OverDrive technology combines SVL’s Deca OverDrive and standard OverDrive engines to deliver lighting that is 10 times brighter than standard continuous mode. “Lights featuring Dual OverDrive technology, like the LHI-DO, produce enough brightness that end users can attach polarizers that retain exceptional light output while handling any speed,” said Kinney. “For applications involving polybags or plastic shrink wrap, this means the machine vision system does not have to slow down and decrease overall throughput." The LHI-DO’s OverDrive–only light source can be used to create tunnel systems capable of illuminating any package—ensuring perfect readability no matter the shape or material. With an integrated camera mount compatible with most machine vision cameras, the light can be directly connected and controlled through a camera’s trigger output. With onboard charging capacitors, the LHI-DO delivers powerful bursts of energy with a low consistent electrical draw. The IP65-rated LHI-DO can be used at working distances between 500 mm and 2000 mm with 10-, 14- and 30-degree lens options.

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Machine vision systems attempting to perform accurate high-speed barcode scanning or optical character recognition (OCR) on packages with reflective plastic wraps or shipping bags run into significant issues with glare. Polarizers can overcome the glare problem, but this comes at a cost, with reduced light output and decreased clarity. Lightigistics lights featuring Dual OverDrive technology are designed specifically to overcome these issues. Dual OverDrive technology combines SVL’s Deca OverDrive and standard OverDrive engines to deliver lighting that is 10 times brighter than standard continuous mode. “Lights featuring Dual OverDrive technology, like the LHI-DO, produce enough brightness that end users can attach polarizers that retain exceptional light output while handling any speed,” said Kinney. “For applications involving polybags or plastic shrink wrap, this means the machine vision system does not have to slow down and decrease overall throughput." The LHI-DO’s OverDrive–only light source can be used to create tunnel systems capable of illuminating any package—ensuring perfect readability no matter the shape or material. With an integrated camera mount compatible with most machine vision cameras, the light can be directly connected and controlled through a camera’s trigger output. With onboard charging capacitors, the LHI-DO delivers powerful bursts of energy with a low consistent electrical draw. The IP65-rated LHI-DO can be used at working distances between 500 mm and 2000 mm with 10-, 14- and 30-degree lens options.

Behind the cornea is a colored, ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract to control the amount of light entering the eye, Fromer said.

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The human eye belongs to a general group of eyes found in nature called "camera-type eyes." Just as a camera lens focuses light onto film, a structure in the eye called the cornea focuses light onto a light-sensitive membrane called the retina.

Most people will develop presbyopia in their 40s or 50s, and start needing reading glasses, Fromer said. With age, the lens gets denser, making it harder for the ciliary muscles to bend the lens, he said.

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When light strikes either the rods or the cones of the retina, it's converted into an electric signal that is relayed to the brain via the optic nerve. The brain then translates the electrical signals into the images a person sees, Fromer said.

Rods are used for monochrome vision in poor light, while cones are used for color and for the detection of fine detail. Cones are packed into a part of the retina directly behind the retina called the fovea, which is responsible for sharp central vision.

Fromer explained that the retina is the innermost of three tissue layers that make up the eye. The outermost layer, called the sclera, is what gives most of the eyeball its white color. The cornea is also a part of the outer layer.

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The leading causes of blindness in the United States include cataracts (clouding of the lens), age-related macular degeneration (deterioration of the central retina), glaucoma (damage to the optic nerve), and diabetic retinopathy (damage to retinal blood vessels), according to the Centers for Disease Control and Prevention (CDC). Other common disorders include amblyopia ("lazy eye") and strabismus (crossed eyes), the CDC says.

"The cornea focuses most of the light, then it passes through the lens, which continues to focus the light," explained Dr. Mark Fromer, an ophthalmologist and retina specialist at Lenox Hill Hospital in New York City. [The 7 Biggest Mysteries of the Human Body]

Ciliary muscles surround the lens. The muscles hold the lens in place but they also play an important role in vision. When the muscles relax, they pull on and flatten the lens, allowing the eye to see objects that are far away. To see closer objects clearly, the ciliary muscle must contract in order to thicken the lens.

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The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Situated behind the pupil is a colorless, transparent structure called the crystalline lens. A clear fluid called the aqueous humor fills the space between the cornea and the iris.

The most common problems with vision are nearsightedness (myopia), farsightedness, (hyperopia), a defect in the eye caused by nonspherical curvature (astigmatism) and age-related farsightedness (presbyopia), according to the National Eye Institute.