Surface flatness describes the deviation between the surface of an optical filter and a perfectly flat reference plano surface. Reflected wavefront error (RWE) and surface flatness are directly related in that flatness describes the physical deviation of
A refractive index prescription that reduces the wavefront error is determined. A beam of energy is directed at a surface of the optical element in accordance with the refractive index prescription to alter the surface to change an index of refraction at multiple locations on the surface.Gene D...
The observed changes of spherical aberration are related to surface curvature changes of the crystalline lens and the cornea. When the pupils were dilated to a diameter of 9.5 mm, our results showed that changes to the shape of the peripheral portion of the lens also caused changes in ...
Precision-Optical Engineering has added IF007, “Wavefront Distortion Measurement — MTF vs. Interferometry,” to its series of downloadable data sheets about interferometry. The two-page document compares two methods of measuring modulation transfer function (MTF) in optical components and systems: Fo...
It should be oriented such that the curved surface is on the side of the collimated beam. Both lens surfaces then contribute to the focusing action. See Figure 5 for examples of typically used configurations. The exactly optimum configuration may e.g. slightly deviate from a plano-convex lens...
Time courses of changes in color-coded maps of HOAs and simulated retinal images from a representative case with gel-forming solution vs eye ointment are shown in Figure 3. Discussion Tear film is the most anterior refractive surface of the eye and an essential optical element, of which ...
At each visit, slit-lamp examination, UDVA, CDVA, residual refractive error with calculation of postoperative MRSE were documented. Pentacam was scheduled 6 months following surgery to assess postoperative topography, front surface Q-value at 6 mm, RMSh, K readings, central and mid-peripheral ...
Exclusion criteria were severe ocular surface disease; use of rigid gas-permeable contact lens; corneal disease; cataracts; baseline difference of greater than 0.75 D in sphere power or greater than 0.5 D in cylinder power between standard manifest and cycloplegic refractions; previous intraocular or...
Consequently, for highly curved wavefronts ϕ, the residual wavefront recovery error creates a caustic effect, which modulates the recovered bright field image, causing ambiguous interpretation of the recovered bright field image, as a result of a mixture of caustic effect and sample intensity. ...
Surface flatness describes the deviation between the surface of an optical filter and a perfectly flat reference plano surface. Reflected wavefront error (RWE) and surface flatness are directly related in that flatness describes the physical deviation of