Place the yardstick against your cheek and bring the card as close to your eye as you can without the print blurring. The minimum distance that you can see the card in perfect focus is your near vision. You can then use the figure at left to determine your near-vision biological age. Many of the tests will require a physician to do the testing because of clinical laboratory tests that require blood work. Other measurements, like pulmonary function, require equipment which only a physician is likely to have.
Some medical equipment is now available to the general public.
This test is conducted in the morning after an overnight fast. The chart at the bottom of the previous page can be used to calculate your glucose-tolerance biological age. Another simple home test is blood pressure. Compare your blood pressure with the chart above to determine your blood-pressure biological age. I think so.