It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism. The procedure can be used to treat astigmatism, nearsightedness, and farsightedness. The PERK study demonstrated that people who undergo RK continue to drift toward hyperopia ("farsightedness"). Strabismus can occur due to muscle dysfunction, farsightedness, problems in the brain, trauma or infections. This means that shortsightedness is not inherently female, nor is farsightedness inherently male. Farsightedness can also result particularly if the lens is highly subluxated. Presbyopia is a visual condition that causes farsightedness. In 1993 she became the first to use this treatment to treat farsightedness. He comes across as a leader with conviction and farsightedness.