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NR. 2(I)/2005
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Neuropatia nerwu
wzrokowego w przebiegu oftalmopatii Gravesa – zależność pomiędzy
perymetrią statyczną a wynikami tomografii komputerowej
Optic Neuropathy in the Course of Graves’ Ophthalmopathy –
Relationship between Static Perimetry and Computed Tomographic
Findings
Jadwiga Janik1, Helena
Jastrzębska2, Małgorzata Gietka-Czernel2,
Stefan Zgliczyński2, Barbara Rożniatowska3
1Poradnia Okulistyczna i 2Klinika
Endokrynolgii Centrum Medycznego Kształcenia Podyplomowego w
Warszawie
Kierownik: prof. dr hab. med. Stefan Zgliczyński
3Zakład Radiologii i Pracownia Tomografii
Komputerowej Szpitala Bielańskiego w Warszawie
Kierownik: lek. med. Krzysztof Lerch |
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| Summary: |
Purpose: To
determine the relationship between visual field defects
and extraocular muscle enlargement in optic neuropathy
in the course of Graves’ ophthalmopathy.
Materials and methods: The CT scans of orbit as
well as central visual field examination (G1X program,
OCTOPUS 1-2-3 Interzeag automated perimeter) were
conducted in 45 patients with optic neuropathy. Muscle
diameters were measured for each orbit. On the basis of
these measurements the muscle diameter index (MI) was
calculated. Grades 1, 2 and 3 of the optic nerve
crowding at the orbital apex were assessed in coronal
planes on CT scans. The relationship between mean defect
(MD) in the central visual field and the muscle index
value (MI), and the degree (grade 1, 2, 3) of the optic
nerve crowding was established.
Results: Linear regression analysis showed
statistically significant positive relationship (r=0.5;
p=0.0001) between the mean defect (MD) and the muscle
index (MI). Analysis of the degree of optic nerve
crowding at the orbital apex showed that the MD had
reached the highest mean value grade 3 of apical
crowding. It differs statistically significantly with
grades 2 and 1.
Conclusions: The linear relationship between the
visual field defects and the enlargement of extraocular
muscle has been found. The evaluation of the degree of
optic nerve crowding at the orbital apex allows
estimating the advance of neuropathy. |
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| Key words: |
optic neuropathy, Graves’
opthalmopathy, automated static perimetry, extraocular
muscle – orbit CT. |
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