The term 'astigmatism' refers to a refractive error of the eye which is characterized by an irregular curvature of the cornea or the lens. Rather than being in the shape of a sphere, the cornea is shaped like an ellipse. When the cornea is curved more in one direction than the other, Breitling Watches. the light rays that fall on the eye are not refracted properly. When there is a difference in the degree of refraction in various meridians, the capacity of the cornea to focus light is adversely affected. This defect may cause the light rays to focus on two points in the back of the eye instead of only one. The eye has varying focal points in different planes. The image may be correctly focused on the retina in the horizontal plane, but not in front of the retina in the vertical plane. This results in blurred vision. This optical defect is generally hereditary. Most of the affected individuals may have an oblong cornea at birth. This vision problem worsens with time. A person who is diagnosed with this refractive error often has difficulty is seeing things clearly. People who have imperfections in the curvature of the cornea or the lens are diagnosed with corneal and lenticular astigmatism respectively. Sir Isaac Newton's contributions to the field of mathematics are known to all. The three , gravitational attraction between bodies, Breitling Evolution. dispersion of light and Newton's rings are just a few of his world famous theories. Newton was born in Woolsthrope, England. He was a mediocre student in school. It was during the summer of 1665, that he proved his mettle by showing his genius in the field of mathematics. During this time he solved calculus problems with a geometrical perspective. He found that addition of infinitesimal small lengths would result in integration and their separation is what is called differentiation. He also proposed that white light or sunlight is not a single color but a combination of seven colors. He also gave a theory that light is a wave and thus, the field of quantum physics came into existence. In 1687, Newton published the book 'Principia', which is considered as the greatest scientific book ever written. In this book he applied the laws of motion and gravitation to the universe, and proved the gravitational attraction between astronomical bodies. Newton, like all other great mathematicians, was a great philosopher too. He provided the scientific world with an array of mathematical theories, from the swinging of a pendulum to the gravitational attraction between astronomical bodies. If you're able to up the ante a bit, you may just find one of the Breitling Bentley watches to your liking. The Bentley's will run quite a bit more, in fact this model will cost you around $21,000, on sale that is. The Bentley is a super chic design and the men's A4436412-B959BKRD happens to be my personal favorite. It's big, bold, and really striking. This model features an 18 carat yellow gold case and bezel. It also has gold accents on the dial and clasp. It has a white dial with luminescent markers. This watch is also a Swiss automatic movement, which Breitling is famous for. Sticking to their trademark size, the Bentley has a 48.7 mm case diameter. Now, you may wonder why the extremely high sticker for this watch. Well, it's a combination of the specialty of the piece paired with the gold accents.