Download Docentföreläsning

Docentföreläsning
Onsdagen den 5 mars, klockan 15.15 i sal FD5 (The Svedbergsalen) anordnas
lärarprov för bedömande av pedagogisk skicklighet för docentur i fysik.
Lärarprovet hålls på engelska.
Föreläsare: Peter Unsbo
Titel och innehåll:
Spherical aberration in the human eye – is it good or bad?
Ever since the invention of the spectacle lens, which appeared in Europe about
1200 A.D., and the understanding of ocular astigmatism in the 19th century, the
correction of refractive errors of the human eye has relied on spherical or toric
lenses. Nonetheless it has also been known for a long time that there are other,
higher-order, aberrations in the eye that limit the visual performance, especially
for larger pupil sizes. Until recently this qualitative knowledge has been more of
an academic interest, since it was neither possible to measure nor to correct these
aberrations. However, during the last ten to fifteen years the research on the
optics of the eye has progressed extensively. Measuring techniques that can map
the wave-front aberrations of the eye have been developed and new ways of
correcting the optical errors are being explored.
Spherical aberration is the largest higher-order aberration in the human eye and
it is the only aberration with a nonzero population average. Furthermore, in
contrast to other aberrations such as, e. g., coma, spherical aberration can be
corrected by rotationally symmetric optical surfaces. These facts form the basis
for an increasing number of optical products on the vision care market which
manipulate the spherical aberration in the eye. This seminar will give a
background on spherical aberration and state of the art aberration measurements
in the human eye. Different aspects of ocular spherical aberration will be
reviewed and the implications and possible visual benefits of correcting, or even
inducing, spherical aberration will be discussed.
Mycket välkommen!
KUNGLIGA TEKNISKA HÖGSKOLAN
KTH
– Applied Physics, AlbaNova University Center, Roslagstullsbacken 21, SE-106 91 Stockholm, www.aphys.kth.se
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