LYCOS RETRIEVER 
Lens: Contact Lens
built 606 days ago
When Nikon started making autofocus (AF) bodies in response to other manufacturers, it incorporated AIS lens technology as well as an in-camera focusing drive motor. The AF - AIS lenses have the AIS groove machined in the lens mounting plate and a slotted drive screw inlet into the mounting plate at about the 5:30 position - there are no "ears" on the lens. At the 12:00 position on the mounting plate, you will see 5 electrical contacts. You will see these lenses normally marketed as AF AIS. Focusing speed was not much to brag about and Nikon later improved it.
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During the week of May 21, 2007, U.S. health investigators linked Complete MoisturePlus, a contact lens solution made by Advanced Medical Optics Inc., to the outbreak of a rare but serious eye infection that can cause blindness. As ofMay 24, 2007, in a probe that includes 35 states and Puerto Rico, the U.S. Centers for Disease Control and Prevention (CDC) identified 138 "culture-confirmed" cases and has interviewed 46 patients. Research illustrates 36 of those people wore soft contact lenses, 21 reported using Advanced Medical Optics Complete MoisturePlus Multi-Purpose a month before symptoms, and 14 used it exclusively. That was enough of a link to a product with limited market share to spark a public announcement, said Sharon Roy, medical epidemiologist with the CDC's division of parasitic diseases.
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Gas permeable contact lenses correct astigmatic vision by maintaining their shape on the cornea, with any corneal irregularity being filled by the tears behind the lens. Soft toric contact lenses function in a different way when used with irregular astigmatism. Toric lenses possess two different focussing powers, created with curvatures at different angles (one for the astigmatism, the other for either myopia or hyperopia as necessary). A toric lens ... possesses a feature to keep the contact lens stable on the eye when you blink or look around. To maintain sharp vision, toric contact lenses cannot rotate on the eye.
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Researchers used the Eyetrack Monitoring System (ETMS), an infrared, video-based system that has been used previously to compare head and eye movements during reading for different spectacle progressive addition lens designs (corrective lenses used in eyeglasses to correct presbyopia). The custom-designed, head-mounted video camera was used to capture the image of the left eye with the contact lenses in place on both eyes during binocular viewing. Lenses were marked with small, black dots to assess lens position. The ETMS captured lens rotational images immediately upon lens insertion, and it continuously collected them at 30 frames per second, until all testing was completed.
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Membership in CLAO indicates that these professionals are especially interested and well versed in the field of contact lens science. CLAO member doctors receive issues of the association’s scientific journal, Eye and Contact Lens: Science and Clinical Practice. This journal is peer-reviewed and referenced by Index Medicus and provides the latest in up-to-date information on contact lenses and vision correction science. Many CLAO members additionally attend CLAO scientific meetings to keep abreast of changes in the field and to interact with other contact lens professionals.
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Researchers used the Controlled Adverse Environment (CAE) model, a proprietary state-of-the-art model for conducting ocular dryness studies, to investigate dryness during contact lens wear. Typically incorporated into clinical trials studying ocular dryness, the CAE is used to exacerbate dryness symptoms in a reproducible, controlled manner by closely regulating humidity, temperature, airflow, lighting, and visual tasking. Acute ocular drying conditions are optimized in the CAE by using appropriate exposure times and requiring subjects to perform a visual task such as reading or working on a computer.
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