Final project-Reading glasses

This is a sample app for my project

this is all about presbyopia Presbyopia (from Greek (πρέσβυς) = old man + ops (ὤψ) = see like, sight > meaning literally trying to see as old men do[1]) is a condition associated with aging in which the eye exhibits a progressively diminished ability to focus on near objects. Presbyopia’s exact mechanisms are not fully understood; research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens’s curvature from continual growth and loss of power of the muscles (the muscles that bend and straighten the lens) have also been postulated as its cause.

The first signs of presbyopia – eyestrain, difficulty seeing in dim light, problems focusing on small objects and fine print – are usually first noticed between the ages of 40 and 50. The ability to focus on near objects declines throughout life, from an accommodation of about 20 (ability to focus at 50 mm away) in a child, to 10 at age 25 (100 mm), and levels off at 0.5 to 1 at age 60 (ability to focus down to 1–2 meters only). The expected, maximum, and minimum amplitudes of accommodation in (D) for a corrected patient of a given age can be estimated using formulas: Expected amplitude (D) = 18.5 - 0.3 x (age in years), Maximum amplitude (D) = 25 - 0.4 x (age in years), Minimum amplitude (D) = 15 - 0.25 x (age in years).