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Focusing power of the eye - The combined action of the cornea and the lens to refract light on to the retina. As light enters the eye, it’s refracted (bent) by the cornea, because of the cornea’s curvature. As the light continues further into the eye, passing through the pupil to reach the lens, it’s refracted more, to a variable degree according to how far away from the eye the object is which is reflecting this light. If it’s down the road a ways, like a distant traffic light, it needs to be refracted less in order to land in focus on the retina. If it’s close up, like the clock on the dashboard, it needs to be refracted more.

Dr William Boothe : Sjogren’s Syndrome - A chronic autoimmune disease where white blood cells attack glands which produce moisture, as in the eyes and mouth. About 90% of sufferers are female, and although it can occur at any age, it usually begins in the late 40s. About half the time it occurs along with certain other autoimmune diseases, such as Lupus and Rheumatoid Arthritis. It is systemic and can affect the digestive tract, blood vessels, liver, kidneys, and other organs. Symptoms include fatigue and joint pain, as well as dryness in the affected areas.

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Astigmatism - (uh-STIG-muh-tiz-um) An eye condition where the cornea is oval-shaped rather than round. This oval shape has two curves: the steeper one and the flatter one. Each curve refracts light at a different angle, sending it to focus on the retina in two different places, and creating distorted vision. It can be mild, with just blurriness, or more severe, with ghosting and severe blurring. In a glasses prescription, the second number expresses the degree of astigmatism you have, and the next number is the number of degrees in the angle of refraction. For example, a prescription of –4.00 – 2.00x34o states that you have 2 diopters of astigmatism at an angle of 34 degrees.

Dr. William Boothe Eye Surgery Slit Lamp - A microscope with a strong light and a variety of magnification settings. It can be sized down to a slit for examining an eye and gives detailed views of the structures and fluids in the eye.





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