By Josef F. Bille, Ulrich von Pape (auth.), Professor Dr. Josef F. Bille, Carol F. H. Harner PhD, Dr. Frieder F. Loesel (eds.)
Refractive surgeons and clinicians are seeking a extra personalized method of refractive surgical procedure. This finished record on sight correction via laser surgical procedure offers the practitioner with sturdy historical past info from most sensible researchers. conscientiously illustrated, it information the newest innovations and medical ends up in wavefront expertise for laser surgical procedure, that's now defining a brand new normal of perform. This moment variation has been considerably elevated to incorporate in-depth descriptions of vital new advances in addition to glimpses of what the longer term holds. The booklet should be imperative to all wishing to increase their wisdom of personalized refractive surgical procedure with an figuring out of the underpinning technology.
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Additional info for Aberration-Free Refractive Surgery: New Frontiers in Vision
As discussed in Chap. 4 t he position of th e image point encodes th e local slope of t he wavefront . In 1971 Roland Shack introduced an advanced version of t he Har tm ann sensor called t he Shack-Hartmann sensor (Fig. 19). F. Bille and U. von Pap e E m- 3 m 3 m E E 3 • • •• ••• Vision Chart distorted by an astigmat ism of 1 diopter m- 3 m 3 3 m w E 3 W 3 m E ••• ••• Vision Chart after correct ion with a 40Jl/l1 segmented Vision Chart after correct ion mirror. with a 37 element membrane mirror.
271' phase wrapping cont rol of t he microm irror no effect on the direction of th e light and can be subtracted without any effect on the wavefront . /2. In fact the use of the mirror is limited to light of one wavelength when using the 27f phase wrap ping meth od . For an objective test of th e active mirror a test device was designed (Fig. 25). This device allows us to measure a phase plate and look through it into the instrument at th e same tim e. Using th e camera at th e test device we get an image of th e target .
4 Wavefront-Sensing Optometer Unlike all the oth er optometers whose tracing light beams enter the eye, the wavefront-sensing optometer uses a Hartmann-Shack sensor [24, 25] , which measur es the outgoing wavefront at th e corneal plane. As shown in Fig. 2, a typical wavefront-sensing optometer consists of 4 prim ary elements . First, an illumination source produces a compact light on th e retina. Th e light is diffusely reflected by the retina to form a distorted wavefront at th e corneal plane if the eye is aberrated.