Beer Info FAQ

What is VD in eye prescription?

What is VD in eye prescription?

The often ignored calculation of vertex distance (VD). The problem is that vertex distance-that is, the distance, measured in millimeters, between the patient's cornea and the back of the ophthalmic lens-has an effect on the perceived power of the lens. It's even more important in higher power lenses:+/-5.00D or more.

Do progressive lenses work?

Progressive lenses or progressive addition lenses (PALs) are the most popular multifocal lenses today, offering an effective and great looking vision solution for individuals with presbyopia (age-related near vision loss). As we age, particularly after the age of 40, our near vision begins to deteriorate.