Page 104 - The Indian Optician Digital Edition September-October 2021

tools are necessary to finish the surface.
Because ranges of smoothing and polishing
tools are no longer necessary it is possible to
produce lenses which are accurate to one-
hundredth of a dioptre in any refractive index
material which is available.
It is this improvement in the
manufacturing process which allows the
laboratory to produce lenses with this
accuracy and for instrument manufacturers to
introduce sight-testing equipment capable of
measuring the refraction to this high degree
of accuracy.

Various major manufacturers have
introduced autorefractors combined with
other technologies such as a wavefront
aberrometer, corneal topographer and
keratometer all incorporated in a single device,
three of which are illustrated in Figure 4.

The i.Profiler plus by Carl Zeiss Vision
is a 4-in-1 compact system that combines
an ocular wavefront aberrometer,
autorefractometer, ATLAS corneal
topographer and keratometer in a single
device. The refraction data is submitted to
Carl Zeiss Vision, together with the measured
values of the i.Profiler plus.

The Rodenstock DNEye Scanner is a
combination of wave front aberrometer,
autorefractor and corneal topographer.
The scanner measures the eyes both for
distance and in near vision. It also ascertains
the higher order aberrations of the eye.
The technology is claimed to offer the
wearer razor-sharp and high-contrast
vision, particularly at twilight. Lenses can be
produced with an accuracy of 0.01D via the
Eye Lens Technology, (EyeLT ) software.
®
Essilor’s Vision-R 800 instrument offers
subjective refraction in 0.01D steps to provide
greater accuracy thanks to a patented,
automated optical module powered by
digitally-controlled motors. The device FIGURE 4 - VARIOUS AUTOREFRACTORS/
provides simultaneous and instantaneous ABERROMETERS CAPABLE OF MEASURING IN
SMALL INCREMENTS OF POWER.
changes of sphere, cylinder and axis, to A) CARL ZEISS VISION I.PROFILER PLUS
reach the final prescription faster, instead of B) RODENSTOCK DNEYE SCANNER
C) ESSILOR VISION R 800 SYSTEM SHOWING THE
examining these components individually. PHOROPTER UNIT AND CONTROL CONSOLE

| SEPT-OCT 2021 | 100 LENS TALK