New Connecting Kids to Coverage Outreach Video. Learn about Las Vegas, Nevada's Foundation for Positively Kids outreach efforts using their network of community-based, school-based, and specialty health care clinics.
Young adults with 20/20 vision can often focus at 4 to 6 inches. At 6 inches, they can see detail at 600 pixels per inch or 300 line pairs per inch. As you age, your lenses become less resilient and the focus distance increases. At about 50 years, the average minimum focus distance is about a foot corresponding to 150 line pairs per inch or 300 pixels per inch. These numbers reflect good light and high contrast scenes. Generally, under more typical conditions, people don't see this well. --.
What is Pupillary Distance? Pupillary distance (PD) measures the space between the pupils of your eyes. Knowing this measurement is important to make sure your eyes match up with the optical center of your lenses. The average adultâs PD is between 54-74; kids' are between 43-54. How to Measure Your PD? Stand 8 in. away from a mirror. Hold a ruler against your brow. Close your right eye then align the rulerâs 0 mm with the center of your left pupil. Look straight then close your left eye and open your right eye. The mm line that lines up to the center of your right pupil is your PD.