Wydanie 1/2006

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

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

Keywords: subjective refraction examination, auto-refractometer, refraction examination after 1.0% Tropicamidum administration, accommodation paralysis