Dynamics of visual improvement following chiasmal decompression. Quantitative pre- and postoperative observations
Version of Record online: 17 OCT 2002
Acta Ophthalmologica Scandinavica
Volume 80, Issue 5, pages 512–516, October 2002
How to Cite
Jakobsson, K.-E., Petruson, B. and Lindblom, B. (2002), Dynamics of visual improvement following chiasmal decompression. Quantitative pre- and postoperative observations. Acta Ophthalmologica Scandinavica, 80: 512–516. doi: 10.1034/j.1600-0420.2002.800510.x
- Issue online: 12 MAR 2003
- Version of Record online: 17 OCT 2002
- Received on February 25th, 2002.Accepted on May 29th, 2002.
- high-pass resolution perimetry;
- optic chiasm;
- pituitary adenoma;
- trans-sphenoidal adenomectomy
Purpose: To study early visual restoration following surgical removal of pituitary adenomas compressing the optic chiasm.
Methods: Eleven patients were examined with high-pass resolution perimetry (HRP) before and after trans-sphenoidal adenomectomy. Visual fields were examined on the second postoperative day. The result was interpreted in terms of the estimated fraction of functioning retino-cortical connections.
Results: In the upper and lower temporal visual field quadrants, the mean increases in the fraction of functioning neural channels were 19% (p < 0.001) and 17% (p = 0.001), respectively, on day 2 after surgery. These increased to 35% on day 12. The nasal hemifield showed no change on day 2, but functioning neural channels had increased by 15% on day 5 (p = 0.017). Mean visual acuity improved from 0.6 preoperatively to 1.0 on day 2 (p = 0.030) but did not change significantly thereafter.
Conclusion: All visual field sectors and visual acuity improved after surgery. Improvement starting in the temporal hemifield was already evident on the second postoperative day.