Allentown Optical Corp.

Transition Promotion & Claim Form

Joe — Wed, 28 Apr 2010 17:58:37 +0000

Allentown Optical Corp. & Transitions Optical, Inc. Promote

“Family of Transitions” by dispensing either Transitions VI or Xtractive lenses. See account page for details. Continue reading for

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Optronics 7E

Joe — Thu, 08 Apr 2010 11:08:38 +0000

Pictures of chuck not

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Checking Prism on a Progressive Lens

Joe — Thu, 04 Feb 2010 15:10:01 +0000

prism reference point

Taken from from http://www.zeiss.com web site:

For a progressive power lens or semifinished lens blank, that point on the front surface stipulated by the manufacturer at which the prismatic effect of the finished lens is determinde. NOTE: The prism measured is the resultant of prescribed prism and prism thinning.

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Refraction Index of Various Substances

Joe — Thu, 04 Feb 2010 13:51:16 +0000

In 1621, a Dutch physicist named Willebrord Snell (1591-1626), derived the relationship between the different angles of light as it passes from one transperent medium to another. When light passes from one transparent medium to another, it bends according to Snell’s law which states: that the angle of refraction is related to the angle of incidence

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Wrap Prescription Sunglasses

Scott — Fri, 04 Dec 2009 18:45:59 +0000

There is high demand for sunwear in wrap form; it is estimated that as many as 25% of the prescription market is dispensed in highly curved lenses. Besides looking cool, wrap sunwear also provides better wind, dust, and sun protection than other lenses since they fit close and reduce light leak. However, the lens position and

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Transposition

Scott — Fri, 04 Dec 2009 17:07:33 +0000

Transposing a Rx prescription is simply converting the prescription from minus cylinder notation to plus cylinder notation. The optical properties of the prescription remain the same.

Procedure: 1) Add the cylinder power to the sphere power to arrive at the new sphere power.

2) Change the sign of the cylinder power.

3) Add or subtract 90 from the axis.

Example 1—

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Trivex for Kids

Scott — Fri, 04 Dec 2009 17:05:05 +0000

It is that time of year when we start thinking about back to school and children’s eyewear. And we do not think about kids’ eyewear without thinking about lens materials. The standard lens material for years has been polycarbonate. Seven years ago we had a newcomer to the lens material arena. In 2001, Trivex hit the optical

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Progressive Jargon

Scott — Fri, 04 Dec 2009 17:02:48 +0000

Progressive lenses are by far one of the most complex lenses on the market. This often leaves the patient begging to know what the difference is between brands and designs. What all progressive lenses have in common is a distance section towards the top of the lens, a reading section towards the bottom nasal area of the

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Contact Lenses

Scott — Fri, 04 Dec 2009 16:44:24 +0000

Properly used contact lenses can be very safe and convenient. However, many wearers take big risks by avoiding yearly eye exams and over wearing their lenses. Both practices can result in serious damage to your eyes. Having contacts fitted by an eye care professional is very important because the cornea (clear outer layer of the eye) can

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Computer Glasses

Scott — Fri, 04 Dec 2009 16:41:56 +0000

Depending on the individual’s vision and type of work, there are several options the type of lenses for computer glasses. Single vision, bifocal, trifocals, and progressive lenses are the main types of lenses prescribed for computer glasses. Most often, a separate pair of glasses is needed for computer work, in addition to the patient’s dress glasses

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