By Herbert Gross (ed.)
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Additional resources for Handbook of Optical Systems, Volume 4: Survey of Optical Instruments
Example text
During adaptation it is primarily the front surface of the eye lens which will have the stronger curvature. The eye is relaxed when it is focused onto an infinitely distant object point. If an eye demonstrates a defect, the correction by glasses or other means is satisfactory when this is achieved. The lens changes its shape during accommodation. A model eye with two aspherical surfaces can be used to demonstrate the geometry of the lens as a function of the accommodation [36-8]. The accommodation interval Dacc depends on the elasticity of the eye lens and decreases with age.
The eye is relaxed when it is focused onto an infinitely distant object point. If an eye demonstrates a defect, the correction by glasses or other means is satisfactory when this is achieved. The lens changes its shape during accommodation. A model eye with two aspherical surfaces can be used to demonstrate the geometry of the lens as a function of the accommodation [36-8]. The accommodation interval Dacc depends on the elasticity of the eye lens and decreases with age. This is illustrated in figure 36-16 and 37-17, where a range of uncertainty is shown.
7 mm and a wavelength of 550 nm for the schematic eye models of Gullstrand and Navarro. The two lines correspond to tangential and sagittal line orientations, respectively. It can be seen that there are significant differences for the two models. In particular, the Gullstrand model is not able to describe the field effects properly and, even on-axis, 30% differences occur in the visibility. 35 36 36 Human Eye field angle 0° 10° 20° accommo- 0 dation [dpt] 3 6 9 12 Spot diagram of the Navarro eye model as a function of the accommodation and the field angle.
