By Jason Porter, (Optical engineer); et al
That includes contributions from the most important researchers within the box, Adaptive Optics for imaginative and prescient technological know-how is the 1st publication committed totally to supplying the basics of adaptive optics in addition to its useful purposes in imaginative and prescient technological know-how. the cloth for this ebook stems from collaborations fostered by means of the heart for Adaptive Optics, a consortium of greater than thirty universities, executive laboratories, and corporations. Read more...
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Additional info for Adaptive optics for vision science : principles, practices, design, and applications
Patient to view a visual acuity chart through adaptive optics. The AO system automatically measures and corrects the aberrations of the patient’s eye and provides a prescription for glasses, contact lenses, or refractive surgery. The phoropter measures the eye’s wave aberration with a Shack–Hartmann wavefront sensor. Wavefront correction in the phoropter is achieved with a microelectromechanical systems (MEMS) deformable mirror. 2 Image Quality Metrics Assessed with Adaptive Optics The effective use of wavefront sensing to refract the eye depends on the ability to transform the wave aberration, which is usually defi ned by several dozen Zernike coefficients, into the values of sphere, cylinder, and axis that generate the best subjective image quality.
By using the Zernike representation for the corneal surface [Eq. 3) n= 0 m=− n where the coefficients cmn are linear combinations of the coefficients amn . On the other hand, the aberrations of the complete eye can be measured using a variety of different subjective and objective techniques. 1 Schematic representation of the procedure to calculate the aberrations of the anterior surface of the cornea. Corneal elevations (z) provided by a videokeratoscope are fit to an expansion of Zernike polynomials.
In adaptive optics (AO) applications, it may be useful to have a statistical description of the aberrations of the system to be corrected. In the case of the atmosphere in astronomical applications, this approach is widely used and is very successful. Although, in the case of the eye, the situation is rather different, we considered a similar statistical approach for the aberrations in a population of normal eyes. If the aberrations of the eye are known, it is possible to correct them using a wavefront correcting device that compensates for the eye’s aberrations in real time.