Poster Jung Yeul Kim

Purpose:

To investigate the axial length of the retinal vein occlusion using contact A-scan sonography and partial interferometry.

Participants:

The Nineteen patients diagnosed of acute retinal vein occlusion with macular edema and the 24 patients diagnosed of chronic retinal vein occlusion without macular edema.

Methods:

The central macular thickness was measured by optical coherence tomography. The axial length was measured using A-scan sonography and partial interferometry. We compared the axial length between affected eye and fellow healthy eye.

Results:

In Acute retinal vein occlusion patients, the central macular thickness were 485.7 ±111.3 µm in the affected eye and 197.8 ±29.7 µm in the healthy eye, showing a statistically significant difference (p<0.001, Wilcoxon signed rank test). Using A-scan sonography, the axial lengths were 23.06 ±0.86 mm in the affected eye and 23.28 ±0.93 mm in the healthy eye, exhibiting a statistically significant difference (p<0.001). Using partial interferometry, the axial lengths were 23.35 ±0.87 mm in the affected eye and 23.38 ±0.95 mm in the healthy eye. There was no statistically significant difference (p=0.456). In Chronic retinal vein occlusion patients, the central macular thickness and axial lengths measured by A-scan sonography and partial interferometry were not statistically significant different between affected eye and fellow healthy eye (p>0.05, Wilcoxon signed rank test).

Conclusions:

We confirmed that short axial length, which was once thought to be one of the risk factors for retinal vein occlusion, results from the properties of the instruments used to measure the axial length. Moreover, we verified that partial interferometry is more accurate for measurement of axial length than A-scan ultrasound when retinal vein occlusion is associated with macular edema.