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2. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position to look through the portion of the lens with the focal power corresponding ...

3. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...

4. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/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.

5. Subjective refraction - Wikipedia

   en.wikipedia.org/wiki/Subjective_refraction

   Adjust the spherical component by adding, increasing and refining the power as required. Initially, adjust by 0.50DS, then refine with 0.25DS. When prescribing minus lens correction, it is crucial that the clinician asks the patient if the letters appear clearer or if they appear smaller and darker (If smaller and darker, do not add the extra ...

6. Average rate on a 30-year mortgage in the US falls to 6.69% - AOL

   www.aol.com/average-rate-30-mortgage-us...

   The average rate on a 30-year mortgage in the U.S. eased again this week, slipping to its lowest level since late October. The rate dropped to 6.69% from 6.81% last week, mortgage buyer Freddie ...

7. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Switching between distance and near vision is accomplished by re-adjusting the lens, instead of by tilting and/or rotating the head. The need for constant adjustment when the person's attention switches to an object at a different distance is a design challenge of such a lens. Manual adjustment is more cumbersome than bifocals or similar lenses.