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PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. [1][2][3] The program is also known by the SIGAD US-984XN. [4][5] PRISM collects stored internet communications based on demands made to internet companies such as Google LLC and ...
Convergence Insufficiency. Other names. Convergence disorder. Specialty. Ophthalmology, optometry. Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence.
This is why people in their 40s start needing reading glasses. Some blue-light glasses also include a plus lens to help bring your focus in. These might help reduce eye strain.
Reading Glasses (5 Pairs) Reading glasses don’t need to cost an arm and a leg, Dr. Raviv says. For just over $15, you can get five pairs of these beloved readers—which means they clock in at ...
Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e., convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e., accommodation). [1] When the human eye engages the accommodation system to focus on a near object, signal is automatically sent to the ...
Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.