To increase the power of the peripheral prism, the bi-part double Fresnel prism combines two prism segments angled to each other. This design allows for up to 43 degrees of expansion to the visual ...

MANTEO - The original lens for the Cape Hatteras Lighthouse, long thought lost to war or thieves, has been found in a climate-controlled storage building on Roanoke Island. The 6,000-pound Fresnel ...

Once they were the height of lighthouse technology--large, beehive-shaped arrangements of hand-cut prisms that could magnify the weak glow of an oil lamp into a beam of light that stretched 20 miles ...

Once, they were the height of lighthouse technology – large, beehive-shaped arrangements of hand-cut prisms that could magnify the weak glow of an oil lamp into a beam of light that stretched 20 miles ...

Three new eyeglasses have now been designedusing high-power prisms to optimally expand the visual fields of patients with hemianopia, a condition in which the visual fields of both eyes are cut by ...

I read with interest the article by D W Kim et al 1 on conservative management for consecutive esotropia (ET) after intermittent exotropia (IXT) surgery. The authors managed patients with full-time ...

ON THE NORTH SHORE -- The view from the top of Split Rock Lighthouse is incredible. But when docents Ed Maki Jr. and Winston Norby climb a narrow metal ladder and scoot next to the lighthouse's ...

When light enters the Bodie Island Lighthouse at the right angle, the 344 prisms of the Fresnel lens “create some truly striking and vibrant rainbows,” the National Park Service reports. National Park ...

Prism Projection, Inc. will be offering attendees at LDI 2011 the opportunity to see the next generation of lighting technology with not only a product launch but also a head to head comparison of ...

The important thing is they didn't drop it. A team of experts on Thursday removed the Fresnel lens from the St. Marks Lighthouse. The lens was installed in 1867. It consists of dozens of glass prisms ...