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Impressum
Rectus muscle thickness measured with echography in different refractional status of the eye
1Hidasi V, 2Kolozsvári B., 3Kolozsvári L.
1KLIN Szemészeti Rt., Korányi fasor 10-11., H-6720 Szeged, 2Debreceni Egyetem, Nagyerdei krt. 98., H-4024 Debrecen, 3Szegedi Tudományegyetem, Szemészeti Klinika, Korányi fasor 10-11., H-6720 Szeged, Hungary
Purpose: To establish whether the thickness of extarocular rectus
muscles shows any relation to refraction.
Patients and methods: 121 otherwise healthy eyes (except myopic
fundus changes) of 74 patients (male: 25, female: 49) were examined. Subjective
refraction, obtained with dilated pupils, was taken into consideration.
Five groups were distinguished according to refraction: 1. hypermetropic,
2. emmetropic, 3. low myopic, 4. moderate myopic and 5. high myopic. Axial
length (immersion A-scan) and muscle thickness (contact B-scan) measurements
were performed with 10 MHz ultrasound probe.
Results: Mean age of hypermetropic patients was 44.9 years, that
of myopic patients was 29.1 years. Axial length showed good correlation
with refraction (r: -0.934, p(0.0001). Sums of muscle width didn't correlate
with refraction, while low (r: -0.335) but significant correlation was
found with axial length. The thinnest were the hypermetropic, the thickest
the moderate myopic muscles with the only significant difference in the
series. No correlation was found between patients' age and muscle thickness.
Conclusions: In our study no essential change in extraocular muscle
thickness was found according to different refractional status of the
eye. If still, that was the neglibile thickening in myopia. In contrary:
when there is a significant change in extraocular musle thickness it is
expected to be accompanied by other symptoms (e.g. strabismus, diplopia).