This condition can be treated with convex or 'plus' lenses that curve outwards. Both types of lenses are available in soft or hard contacts. Astigmatism is a condition where the eyeball is an ...

lenses with extended depth of focus (EDOF), and lenses for astigmatism correction (toric lenses). In the context of refractive lens surgery, such as for correcting presbyopia (age-related vision ...

chances are good it was with a macro lens. Macro lenses are built with a specific optical construction that enables the dramatic magnification of small subjects. They're also designed to focus at ...

In earliest times, circuits could be broken only by separation of contacts in air followed by drawing the resulting electric arc out to such a length that it can no longer be maintained. This means of ...