Category: Eye Care

The Science of Contact Lenses


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Contact Lenses

Robert Deck serves as an optometrist in the office of Todd Harris and Associates in Lapeer, Michigan. Robert Deck draws on more than 20 years of experience in caring for Michigan patients and is experienced in working with patients who wear contact lenses.

At the most basic level, contact lenses function largely like tiny eye glasses. They help to refract light entering an eye that, due to structural abnormalities, does not focus light in a way that supports clear vision.

For patients with nearsightedness, uncorrected vision means that light entering the eye focuses to a point before it reaches the retina. Contact lenses for this condition effectively reduce the angle of focus, so that the focus point shifts backward to the retina. Lenses for patients with farsightedness, by contrast, increase the focusing power of the eye so that light does not hit the retina before it has had a chance to converge.

Because a contact lens rests on the cornea, it can perform this function without nearly the surface area of a typical eyeglass lens. The optic zone, which provides vision correction, only needs to be as large as the pupil, while the rest of the lens allows for fit to the eyeball. A pair of glasses must have a significantly larger optic zone, as the refracted light must travel much farther to reach the eye, just as a window must be larger than a peephole to view the street from across a room.

Contact lenses can be used to correct nearsightedness, farsightedness, individuals with astigmatism and even people who wear bifocals. Dr. Robert Deck, of Michigan, also uses contact lenses in the treatment of ocular disease and trauma. Cometic contact lenses that can change eye color are also available.


Causes and Treatments of Ambylopia

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Robert Deck serves as an optometrist at the office of Todd Harris and Associates in Lapeer, Michigan. There, Robert Deck of Michigan offers eye testing and diagnosis of presenting vision issues, including ambylopia.

Also known as “lazy eye,” ambylopia occurs when one eye cannot properly communicate with the brain. In patients with normal vision, cells in the retina collect light images and translate those images into neurological signals that travel to the brain by way of the optic nerve. If there is any interruption in the process, the brain perceives the signals from the affected eye as a blurry image.

When the brain receives blurry images from one eye and clear images from another, in time it begins to disregard the images from the blurry eye. This leads to under-stimulation of the affected optic nerve pathways and causes vision in that eye to worsen.

Ambylopia does not stem from the same single cause in all patients. Some develop the condition because one eye focuses significantly more effectively than the other, while others experience it as a result of misalignment of the eyes themselves. Sometimes, it arises due to a clouding of the anterior region of the eye, a condition called cataract.

Ambylopia does not respond to corrective lenses, but it can be highly treatable in children. Treatment typically involves forcing the brain to learn to communicate with the weaker eye, either through patching or by way of eye drops. Medical science has not yet had a great deal of success in treating the condition in adults, though research continues to explore the possibility.

Diabetic Retinopathy – Development and Treatment


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Diabetic Retinopathy

Dr. Robert Deck of Michigan has practiced optometry for more than 20 years. Robert Deck, OD, currently serves on the team at Todd Harris and Associates in Lapeer, Michigan, where he welcomes patients with diabetic eye disease.

Diabetic eye disease is not a single disorder but rather a classification granted to those conditions that frequently arise in patients with diabetes. A subset of such conditions is diabetic retinopathy, which occurs when chronic high blood sugar causes damage to the blood vessels in the back of the eye. This in turn causes swelling in the blood vessels of the retina, which can then leak or distort in shape.

In some cases, leaking fluid collects in an area of the retina known as the macula, which is responsible for vision focus. Such collection of fluid causes the macula to swell and in turn leads to blurring of vision. This is the most common contributor to vision loss in patients with diabetes.

Untreated diabetic retinopathy may also advance to the disease’s proliferative form, in which damage to retinal blood supply leads to the growth of new blood vessels. This new growth is abnormal and prone to leakage, which may cause scar tissue development and retinal detachment, often leading to irreversible vision loss.

Because effects of diabetic retinopathy become more severe as the disease progresses, early detection is crucial. If discovered soon enough, physicians may be able to slow leakage through laser therapy or injected medication, the latter of which can also limit the growth of abnormal blood vessels.

Development and Presentation of Myopia

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Dr. Robert Deck has served as an optometrist in Michigan for more than 25 years. In that time, Dr. Robert Deck has diagnosed numerous Michigan patients with myopia and other refractive abnormalities.

Myopia, or nearsightedness, is an extremely common vision anomaly. It affects more than 30 percent of individuals in the United States and has increased notably in prevalence in the 30 years leading up to the new millennium. It is most commonly diagnosed in middle childhood and generally progresses steadily until approximately the age of 20, though new diagnoses may also occur in adults who have certain medical conditions or experience eye strain.

Myopia causes objects that are far away to appear blurred, though the patient can still see nearby objects clearly. It typically develops when the eyeball becomes abnormally long, which in turn interferes with the normal path of light form the cornea to the retina. It may also occur when the lens of the eye is too thick or the cornea abnormally curved, though some patients’ myopia is a result of two or more of these abnormalities occurring in the same eye.

Individuals with myopia can most often experience normal vision with eyeglasses or contact lenses, though some may choose to undergo refractive surgery for a more permanent correction. This option is only available to patients whose eyes have stopped growing.

Amblyopia – Types and Treatment

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As an optometrist with Todd Harris and Associates in Michigan, Dr. Robert Deck performs eye examinations to assess for correction needs and potential disorders. Dr. Robert Deck of Michigan draws on an in-depth knowledge of amblyopia and other ocular abnormalities.

Colloquially known as lazy eye, amblyopia stands out as the most common cause of vision loss in childhood. It occurs when the brain learns to use one eye more than the other, which in turn leads to a lack of development in the nerve pathways between the brain and the less-used eye.

Amblyopia often develops secondary to a condition known as strabismus, which is characterized by the misalignment of one of the two eyes. Because the strabismic eye is rotated up, down, inward, or outward, the brain learns to disregard the signals from that eye.

Other cases of amblyopia develop when one eye is significantly more nearsighted or farsighted than the other. In these situations, known as refractive amblyopia, the brain often adapts by seeing clearly from the normal eye, and a diagnosis of amblyopia does not happen until the patient undergoes a vision test.

Similarly, children with cataracts or other vision disorders may develop a condition known as deprivation amblyopia, in which the eyes do not have enough practice seeing to develop strong connections. This may lead to long-term vision loss if not identified early in life.

In fact, amblyopia is in general significantly more treatable with early detection. Many children respond well to interventions such as eye patching or prescription lenses, which alter the balance between the eyes and force the brain to learn to use the lazy eye. In these cases, vision therapy can help the change to become permanent.