PURPOSE To investigate whether corneal wavefront aberrations vary with aging. METHODS One hundred two eyes of 102 normal subjects were evaluated with videokeratography. The data were decomposed using Taylor and Zernike polynomials to calculate the monochromatic aberrations of the cornea for both small (3-mm) and large (7-mm) pupils. RESULTS For a 3-mm pupil, the amount of total aberrations ...

purpose: to compare tecnis z9000 and akreos ao aspheric intraocular lenses (iols) in terms of spherical aberration and contrast sensitivity. methods: thirty-four eyes of 34 patients undergoing phacoemulsification cataract surgery were randomly assigned for implantation of tecnis or akreos ao iols. three months postoperatively, best-corrected visual acuity (bcva), spherical aberration (with 4 an...

The aberration of a multipole Wien filter for energy-filtered x-ray photoemission electron microscopy was analyzed and the optimized Fourier components of the electric and magnetic fields for the third-order aperture aberration corrections were obtained. It was found that the third-order aperture aberration correction requires 12 electrodes and magnetic poles.

The precision and work efficiency of the distributed repeat projection lithography machine (DSW) directly affect special requirements large-scale integrated circuit production process. In order to improve exposure imaging accuracy projection, paper proposes object image difference in-situ detection (AMF) technology based on particle swarm optimization. article analyzes basic principles this usi...

By optimum combination of optical pre-processing and digital post-processing, or optical coding and digital decoding of the image information, incoherent optical systems invariant to numerous aberrations can be formed. The theory of aberration invariance can also be used with low-cost, low-precision optics to produce systems that image with the performance of high-cost, high-precision, or near ...

The wave aberration of human eyes is retrieved from actual point-spread-function (PSF) data and the modulus of the pupil function. The PSF had been obtained previously by application of a hybrid optical-digital method developed recently. The retrieval is done by using a bidimensional Gerchberg-Saxton phase-retrieval algorithm joined to an iterative phase-unwrapping algorithm. To obtain an adequ...

background: most of our current understanding of the biological effects of exposure to ionising radiation is based on conventional cytogenetic techniques, which enable us to determine the relationship between chromosomal aberration and dose received by radiation workers. however, conventional techniques have numerous limitations and chromosomal aberrations can be easily missed. since fish plays...