When unpolarized light is incident on a boundary between two dielectric surfaces, for example on an air-water boundary, then the reflected and transmitted components are partially polarized.  The reflected wave is 100% linearly polarized when the incident angle is equal to an angle called the Brewster angle.  For water this angle is is ~53o with respect to the normal or 37o with respect to the water surface. For are considerable angular range around the Brewster angle the reflected light is highly polarized in the horizontal direction.

Five Points Eye Care Center is located in Athens, Georgia in the historic Milledge Avenue District, close to downtown, the University of Georgia and the Five Points business district.

Nearsightedness, know as Myopia, is one of the most common vision problems. It is mostly corrected with glasses, contact lenses or refractive surgery, depending on the degree of myopia.

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Optically active or circular birefringent materials rotate the direction of polarization of linearly polarized light.  The amount of rotation depends on the wavelength of the light.  Sugar molecules have a handedness (chirality) and in solution are optically active.  If we polarize white light and pass it through sugar syrup, the direction of polarization of the light emerging from the syrup will be different for the different color components.  If the light then passes through a second polarizer, its color changes with the orientation of the transmission axis of this polarizer.

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When unpolarized light passes through a polarizer, the intensity is reduced by a factor of ½.  The average of cos2θ, averages over all angles θ is ½. Itransmitted = I0all angles = ½I0.

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Is your child struggling at reading? Do you suffer from dizziness and headaches? Ever experience double vision? Vision Therapy retrains the brain to more effectively interact with the eyes and therefore improve vision functioning.

Our optical also offers scleral contact lenses for patients with challenging contact lens needs. We give every patient a personalized eye care experience. Read our newsletter and let us know how we can help you!

An ideal polarizer is a material that passes only EM waves for which the electric field vector is parallel to its transmission axis.  The electric field is a vector and can be written in terms of the components parallel and perpendicular to the polarizer's transmission axis.  E = Eparallel + Eperpendicular.  An ideal polarizer passes Eparallel and absorbs Eperpendicular.If E0 is the incident field vector and the angle between E0 and the transmission axis is θ, then the magnitude of transmitted field vector is E0 cosθ and its direction is the direction of the transmission axis.  The intensity I of an electromagnetic wave is proportional to the square of the magnitude of the electric field vector.  We therefore haveItransmitted = I0 cos2θ. This is called the law of Malus.  If θ = 90o the transmitted intensity is zero.

Other specialties we offer include myopia management, dry eye treatment, neuro-optometry services, and ortho-k for adults.

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There are different polarization mechanisms.  The most common method of producing polarized light is to use polaroid material, made from chains of organic molecules, which are anisotropic in shape.  Light transmitted is linearly polarized perpendicular to the direction of the chains.  The transmission axis is perpendicular to the chains.

A beam of unpolarized light of intensity I0 passes through a series of ideal polarizing filters with their transmission axis turned to various angles, as shown in the figure. (a)  What is the light intensity (in terms of I0) in regions A, B, and C? (b)  If we remove the middle filter, what will be the light intensity at point C?

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Scleral lenses provide greater durability, easier handling and a lower risk for complications. Five Points Eye Care has a wide range of custom scleral contact solutions that can work for you.

Polarization is a phenomenon peculiar to transverse waves.  Longitudinal waves such as sound cannot be polarized.  Light and other electromagnetic waves are transverse waves made up of mutually perpendicular, fluctuating electric and magnetic fields.  In the diagram below an EM wave is propagating in the x-direction, the electric field oscillates in the xy-plane, and the magnetic field oscillates in the xz-plane.  A line traces out the electric field vector as the wave propagates.

An unpolarized electromagnetic wave traveling in the x-direction is a superposition of many waves.  For each of these waves the electric field vector is perpendicular to the x-axis, but the angle it makes with the y-axis is different for different waves.  For unpolarized light traveling in the x-direction Ey and Ez are randomly varying on a timescale that is much shorter than that needed for observation.

Our licensed dispensing opticians are committed to giving you personalized, knowledgeable service for all of your eyewear needs, providing a wide selection of frames and specialty lenses including children's eyewear, industrial safety, designer frames and sunglasses, computer-specific lenses and many more.

Some materials turn birefringent when stressed.  By placing transparent materials between two polarizers, we can perform stress analysis tests.

Our doctors, Dr. Jon Forché, Dr. Nadine Humen Forché, and Dr. Meg Brya, provide quality, experienced eye care. Drs. Jon and Nadine Forché and Dr. Meg Brya are the only Diplomates of the American Board of Optometry in the Athens area.

A polarizer produces linearly polarized light.  It is often convenient to orient the transmission axis of a polarizer vertically or horizontally to produce light with vertical or horizontal linear polarization.

When the sun is at a low angle in the sky, the sunlight reflecting off the surface of water is nearly 100% horizontally polarized because the angle of incidence is close to the Brewster angle. Glare-reducing sunglasses are coated with a polarizer with a vertical transmission axis and therefore block the reflected light.

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Our Athens opticians are here to help you find just the right pair of glasses or contacts for you. We have a wide selection of glasses frames from some of the most popular brands in eyewear today.

Our friendly clinic and business office staff make every effort to create a caring, comfortable environment for every patient in our office.

Five Points Eye Care complies with applicable Federal civil rights laws and does not discriminate on the basis of race, color, national origin, age, disability, or sex.

Certain birefringent crystalline substances bend light trough an angle that depends upon the state of incident polarization.  The have an optic axis.  Unpolarized light entering a birefringent crystal not along the optic axis of the crystal is split into beams which are bend by different amounts.

For a linearly polarized electromagnetic wave traveling in the x-direction, the angle the electric field makes with the y-axis is unique.

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We offer low vision services for people who have lost vision from eye diseases, and vision therapy for children with problems with vision or visual processing.