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NR. 1/2006
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Wpływ zastosowania
1% Tropicamidum na wynik pomiaru refrakcji autorefraktometrem
The effect of 1%
Tropicamidum Administration on the Results of Refraction
Measured with Auto-refractometer
Emilia Dębińska1, Andrzej
Styszyński2, Ryszard Naskręcki1
1 Zakład Elektroniki Kwantowej Wydziału Fizyki
Uniwersytetu im. Adama Mickiewicza w Poznaniu
Kierownik: prof. dr hab. Ryszard Parzyński
2 Oddział Okulistyczny Szpitala Wojewódzkiego w
Poznaniu
Ordynator: dr n. med. Ryszard Philips |
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| Summary: |
Aim: The aim of the paper
is to assess the effect of 1% Tropicamidum use on the of
refraction examination results with auto-refractometer
in relation to the subjective examination of refraction
using a foropter. Material: Study was conducted in the
Ophthalmologic Out-patient Clinic of the Province
Hospital in Poznań from October 2003 to May 2004. The
research covered 100 patients, who did not have
pathological changes causing visual acuity decrease.
Methods: A subjective examination using foropter was
carried out with the natural pupil size pupil. Then
objective examination was carried out using Zeiss
Humphrey System Acuitus 5010 or Tomey RC 4000
auto-refractometer with the natural pupil size and after
a single 1.0% Tropicamidum administration, repeating the
examination for different pupil sizes (every 1 mm). All
subjects were divided in two main groups, depending on
the type of the auto-refractometer used for the
objective refraction examination. In each of the main
group the myopic and hyperopic eyes were isolated.
Results: The error of auto-refractometer examination
should be determined as the difference of this result
and the result of the subjective examination (i.e. using
foropter or the manual crossed cylinder). In our thesis
we also assumed the difference ∆R of the result of
refraction examination with auto-refractometer Ro and
the result of the refraction examination with foropter
Rs as the inaccuracy measurement. ∆R=Ro-Rs The curves
∆R=∆R(ΔD) representing the relation of ∆R to the
difference of the pupil size ΔD increase, where with
greater pupil size the increase is smaller. The
relations found ∆R=∆R(∆D) are similar for both
auto-refractometers. Also their flow is similar for
myopic and hyperopic eyes. Accommodation paralysis is
the factor decisive of the flow of ∆R=∆R(∆D). A single
1% Tropicamidum administration causes the average
relaxation of accommodation tension by 0.63 D in myopic
eyes and approximately 0.27 D in hyperopic eyes.
Conclusions: 1. Pupil dilatation with the mydriatic
facilitates the refraction examination with
auto-refractometer. 2. Both for myopic and the hyperopic
eyes, as well as astigmatic eyes a single 1%
Tropicamidum administration increases the accuracy of
refraction measurement with auto-refractometer. |
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| Key words: |
subjective refraction
examination, auto-refractometer, refraction examination
after 1.0% Tropicamidum administration, accommodation
paralysis. |
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