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increase the radius of curvature of the posterior cornea c. moving the crystalline lens forward toward the cornea d. increase the refractive index of the cornea e. The Swedish ophthalmologist and self-taught mathematician Allvar Gullstrand (1862-1930) invented the slit lamp to illuminate the anterior of the eye. With its rectangular beam of very bright light, he studied the structure of the cornea and the function of the lens.

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(gŭl′strănd′), Allvar 1862-1930. Swedish ophthalmologist. He won a 1911 Nobel Prize for his study of the dioptrics of the human eye. Each year, 5,500 patients with diabetes in Scotland need to see a NHS eye specialist for the first time due to clinically significant retinopathy.

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Gullstrand’s exact schematic eye with six cardinal planes: the two focal planes in front of the eye (F) and in the retina (F’), the two principal planes closely together in the middle of the anterior chamber (H and H’) and the two nodal planes (N and N’) just in front of the posterior pole of the lens. In the principle of these results, the authors calculated the new values of cardinal points for the eye, and compared with Gullstrand's optical schematic eye. So, the refractive power for the eye F = 59.98 D, first focal length f1 = -16.67 mm and second focal length f2 = +22.27 mm Reduced schematic eyes

• Cornea represented as the only source of refractive power of the eye.

• Lens is completely neglected.
  

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  For example, if the Gullstrand ratio is 0.7 (ie, as a result of a 7.00 D ablation; Figure 3), the difference between the true corneal power and the K reading is approximately 2.00 D. crystalline lens. Reduced eye models have developed to calculate refracted ray vector simply. Theoretically, it has only one refractive surface of anterior surface of cornea, and the equivalent axial length of eye ball. In this study, Gullstrand reduced eye model is used for the calculation of aberration by taking the geometrical shape of The Schematic Eye of Gullstrand or the Reduced Eye of LeGrand, are technically based on a paraxial optical analysis.
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  Department of Physics, Chemistry and Biology January

  The image is the same size as in emmetropia because, according to Gullstrand's equation, the equivalent power of the combined lens and eye is 58 D, and this is precisely the same as the power of the reduced emmetropic eye. First, according to the Gullstrand eye model, the AL of the eye globe is 24.38 mm [15], and other modified schematic eyes and investigation results have shown this length to be around 24 mm [16, 17]. Instead Allvar Gullstrands’ schematic eye was used as the basis for these calculations. Allvar Gullstrand received a Nobel prize for his work and, although the schematic eye was a major breakthrough at the time, advances in technology and tireless research since then means that 100 years on we can take a more advanced approach to lens design. reduced eye, Gullstrand simplified or Gullstrand-le Grand eye, Swiegerling eye can be described as ideal theoretical models due to their assumptions valid in the paraxial domain [5], [8-9], [11-12]. The Arizona eye model that was used also in the present study is one of the recently developed theoretical eye model and far the most comprehensive Allvar Gullstrand, Swedish ophthalmologist, recipient of the 1911 Nobel Prize for Physiology or Medicine for his research on the eye as a light-refracting apparatus. Gullstrand studied in Uppsala, Vienna, and Stockholm, earning a doctorate in 1890.