Opti-fun: Fun Optical Facts

Here are 40 amazing Opti-fun facts you will love:

Opti-fun facts

The cornea is the only part of the human body that has no blood supply. It gets its oxygen directly from the air.
The human eye can detect a candle flame from up to 30 miles away.
The shortest measurable length of time is the time it takes for light to travel the length of one hydrogen molecule, which is approximately 1/100,000,000,000,000th of a second.

If you stare at a red object for a prolonged period of time and then look at a white surface, you will see a green afterimage. This is because the red cones in your eyes become “fatigued” and the green cones become more sensitive.
The retina of an owl’s eye has a higher density of rod cells, which are responsible for detecting light in low-light conditions. This allows owls to see in near-total darkness.
The owl’s eyes are fixed in their sockets, so they must move their entire head to change their field of vision.

Owls have a third eyelid called a nictitating membrane, which is transparent and moves horizontally across the eye to protect and clean the cornea while still allowing the owl to see.
The reason why the sky appears blue is due to a phenomenon called Rayleigh scattering, where the shorter wavelength blue light is scattered more than the longer wavelength red, orange, and yellow light.
The world’s largest camera lens is the Canon EF 1200mm f/5.6L USM, which weighs 36 pounds and costs around $180,000.

The world’s smallest camera is the Eyeball, which measures just 0.99mm in diameter and is used in medical procedures.
The first photograph ever taken was captured in 1826 by Joseph Nicéphore Niépce. It took eight hours to expose and is now known as the “View from the Window at Le Gras.”
The human eye can distinguish between approximately 10 million different colors.

The average person blinks about 15-20 times per minute, or approximately 28,000 times per day.
The world’s largest human eye belonged to a whale and measured over 12 inches in diameter.
The first contact lenses were made out of glass and were introduced in the late 1800s.

The world’s first camera phone was introduced in 2000 by Sharp and had a resolution of just 0.1 megapixels.
The human eye can process visual information up to 10 times faster than sound.
The average person can read about 200-300 words per minute, while speed readers can read up to 1,000 words per minute.

The world’s largest telescope, the Gran Telescopio Canarias, located in the Canary Islands, has a diameter of 10.4 meters and can capture light from objects 14 billion light-years away.
The world’s smallest camera drone, the Cheerson CX-10, measures just 2.2 x 2.2 x 2.2 centimeters.
The eye of an ostrich is the largest of any land animal and measures about 2 inches in diameter.

The human eye can see stars that are up to 4,000 light-years away on a clear, dark night.
The human eye can distinguish about 10 million different colors.
The human eye blinks about 12 times per minute.

The retina contains about 120 million rods and 6 million cones, which are responsible for processing light and color.
The lens of the eye is responsible for focusing light on the retina, and can change shape to adjust for near or far vision.
The human eye is capable of processing images at a rate of up to 1,000 frames per second.

The iris is the colored part of the eye, and its color is determined by the amount and type of pigments in the iris.
The eye’s natural lens is able to filter out harmful UV radiation from sunlight.
The eye is the fastest muscle in the body, capable of moving at speeds of up to 1000 degrees per second.

The human eye can detect a single photon of light.
The human eye can distinguish between about 7 million different shades of color.
The fovea is a small, central area of the retina that is responsible for our sharpest vision, and contains a high concentration of cones.

The blind spot in the eye is where the optic nerve exits the eye, and there are no photoreceptor cells in this area.
The human eye is about 24 mm in length, with a diameter of about 23 mm.
The human eye is capable of adapting to changes in light levels, allowing us to see in both bright sunlight and dimly lit rooms.

The eye’s tear ducts produce tears to help keep the eye moist and flush out any foreign objects.
The human eye can detect movement in just a few milliseconds.
The human eye is able to adjust to changes in focus in about one-quarter of a second.