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NR. 4(II)/2008
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Porównanie
kontaktowej metody pomiaru długości gałki ocznej z metodą
immersyjną
Comparision of Contact and Immersion Techniques for Axial Length
Measurement
Marcin Jezierski, Marek Prost,
Jarosław Kuliński, Karol Stasiak, Michał Szot
Klinika Okulistyczna Wojskowego Instytutu Medycyny Lotniczej w
Warszawie
Kierownik: prof. dr hab. n. med. Marek E. Prost |
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| Summary: |
Purpose: To
calculate IOL power usually A-scan ultrasound technique
is used. The aim of the study was to evaluate the
results of axial length measurements obtained with
contact and immersion technique and to assess the
accuracy of these methods.
Material and Methods: One hundred and forty five
eyes were measured by both methods using ultrasound
device Ocu Scan Rxp ALCON, done by one investigator. We
measured the correction for the best corrected visual
acuity two months after surgery. The differences between
this correction and expected correction determined
before surgery were defined as the mean refractive error.
The magnitude of this error was used to evaluate the
accuracy of the both methods.
Results: The mean axial length was found to be
23.05 mm with the contact technique and 23.28 mm with
the immersion technique. The mean anterior chamber depth
measured by contact method was 3.15 mm and by immersion
technique was 3.28 mm. The mean thickness of the lens
was also different; with the contact technique was 4.61
mm, with immersion method was 4.68 mm. The mean standard
deviation between repeated measurements of the same eye
was smaller with the immersion technique (0.071) than
with the contact technique (0.087). The mean refractive
error was found to be 0.76 Dsph using the contact method.
The mean refractive error was 0.53 Dsph when the
immersion technique was used.
Conclusions: The axial length was smaller with
the contact technique. Shorter measurements produced
stronger intraocular lens power by using the contact
technique. Smaller mean refractive error and smaller
mean standard deviation between repeated measurements of
the same eye suggest, that the immersion method is more
accurate than the contact method. |
| Key words: |
axial length, ultrasound
biometry, IOL power calculation. |
| Słowa kluczowe: |
długość gałki ocznej,
biometria ultrasonograficzna, kalkulacja mocy soczewki
wewnątrzgałkowej. |
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