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Axial length measurement and asteroid hyalosis
E F Erkin1, S Tarhan, F Oztürk
1Department of Ophthalmology, Celal Bayar University School of Medicine, Manisa, Turkey.
Purpose:
To evaluate the effect of asteroid hyalosis on automated and manual A-scan axial length measurements.
Setting:
Celal Bayar University School of Medicine, Manisa, Turkey.
Methods:
A case-control study comprised 15 patients with unilateral asteroid hyalosis. The uninvolved eyes were used as controls. Axial length measurements by manual and automated A-scan biometry were performed in both eyes. The main outcome measures were comparisons between manual and automated measurements in asteroid hyalosis eyes with those in control eyes and the assessment of density of asteroid bodies on B-scan photographs.
Results:
Statistical analysis revealed no significant difference between axial lengths of asteroid hyalosis eyes and those in control eyes with automated (P = .524) or manual (P = .163) methods. Using automated biometry, 1 patient (7%) had a false (6.23 mm) short axial length measurement in the eye with asteroid hyalosis. There were no significant correlations between manual versus automated measurement differences and the density of the asteroid bodies.
Conclusions:
The axial length of the eye without asteroid hyalosis can be used to calculate intraocular lens power if the patient has no history of clinical anisometropia.