Abstract
To evaluate the effects of radial optic neurotomy (RON) on retinal circulation in patients with central retinal vein occlusion (CRVO) by indocyanine green (ICG) videoangiography and a computer-assisted image analysis. An interventional case series. RON was performed in 15 eyes of 15 patients with CRVO. Within 72 hours before the surgery and at 3 months after the surgery, ICG videoangiography was performed with a scanning laser ophthalmoscope, and the images were transferred to a computer. Two measurement points were selected, one on a main retinal artery close to the optic disk and the other on the corresponding retinal vein. At each point, fluorescence intensities were serially measured, and dye dilution curves were obtained. Retinal circulation times (ΔT 50) before and after the surgery were calculated. Mean preoperative ΔT 50 was 6.46 ± 1.36 seconds, and mean postoperative ΔT 50 was 6.80 ± 2.50 seconds. In 8 of 15 eyes, T 50 decreased by 6.8% to 29.6% after the surgery. In the seven eyes that developed chorioretinal anastomosis (CRA) at the site of RON, ΔT 50 decreased after the surgery. In contrast, ΔT 50 decreased postoperatively in only one of the eight eyes without CRA. Best-corrected visual acuity improved significantly after the surgery in the group of eyes with improvement in ΔT 50, but not in the group of eyes without improvement inΔT 50. Some degree of retinal circulation improvement occurred in approximately half of these eyes, which appears to be correlated with the development of CRA.
| Original language | English |
|---|---|
| Pages (from-to) | 612-619 |
| Number of pages | 8 |
| Journal | American Journal of Ophthalmology |
| Volume | 138 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Oct 2004 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Ophthalmology
Cite this
Evaluation of radial optic neurotomy for central retinal vein occlusion by indocyanine green videoangiography and image analysis. / Nomoto, Hiroyuki; Shiraga, Fumio; Yamaji, Hidetaka; Kageyama, Mitsuyo; Takenaka, Hirokazu; Baba, Tetsuya; Tsuchida, Yozo.
In: American Journal of Ophthalmology, Vol. 138, No. 4, 10.2004, p. 612-619.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluation of radial optic neurotomy for central retinal vein occlusion by indocyanine green videoangiography and image analysis
AU - Nomoto, Hiroyuki
AU - Shiraga, Fumio
AU - Yamaji, Hidetaka
AU - Kageyama, Mitsuyo
AU - Takenaka, Hirokazu
AU - Baba, Tetsuya
AU - Tsuchida, Yozo
PY - 2004/10
Y1 - 2004/10
N2 - To evaluate the effects of radial optic neurotomy (RON) on retinal circulation in patients with central retinal vein occlusion (CRVO) by indocyanine green (ICG) videoangiography and a computer-assisted image analysis. An interventional case series. RON was performed in 15 eyes of 15 patients with CRVO. Within 72 hours before the surgery and at 3 months after the surgery, ICG videoangiography was performed with a scanning laser ophthalmoscope, and the images were transferred to a computer. Two measurement points were selected, one on a main retinal artery close to the optic disk and the other on the corresponding retinal vein. At each point, fluorescence intensities were serially measured, and dye dilution curves were obtained. Retinal circulation times (ΔT 50) before and after the surgery were calculated. Mean preoperative ΔT 50 was 6.46 ± 1.36 seconds, and mean postoperative ΔT 50 was 6.80 ± 2.50 seconds. In 8 of 15 eyes, T 50 decreased by 6.8% to 29.6% after the surgery. In the seven eyes that developed chorioretinal anastomosis (CRA) at the site of RON, ΔT 50 decreased after the surgery. In contrast, ΔT 50 decreased postoperatively in only one of the eight eyes without CRA. Best-corrected visual acuity improved significantly after the surgery in the group of eyes with improvement in ΔT 50, but not in the group of eyes without improvement inΔT 50. Some degree of retinal circulation improvement occurred in approximately half of these eyes, which appears to be correlated with the development of CRA.
AB - To evaluate the effects of radial optic neurotomy (RON) on retinal circulation in patients with central retinal vein occlusion (CRVO) by indocyanine green (ICG) videoangiography and a computer-assisted image analysis. An interventional case series. RON was performed in 15 eyes of 15 patients with CRVO. Within 72 hours before the surgery and at 3 months after the surgery, ICG videoangiography was performed with a scanning laser ophthalmoscope, and the images were transferred to a computer. Two measurement points were selected, one on a main retinal artery close to the optic disk and the other on the corresponding retinal vein. At each point, fluorescence intensities were serially measured, and dye dilution curves were obtained. Retinal circulation times (ΔT 50) before and after the surgery were calculated. Mean preoperative ΔT 50 was 6.46 ± 1.36 seconds, and mean postoperative ΔT 50 was 6.80 ± 2.50 seconds. In 8 of 15 eyes, T 50 decreased by 6.8% to 29.6% after the surgery. In the seven eyes that developed chorioretinal anastomosis (CRA) at the site of RON, ΔT 50 decreased after the surgery. In contrast, ΔT 50 decreased postoperatively in only one of the eight eyes without CRA. Best-corrected visual acuity improved significantly after the surgery in the group of eyes with improvement in ΔT 50, but not in the group of eyes without improvement inΔT 50. Some degree of retinal circulation improvement occurred in approximately half of these eyes, which appears to be correlated with the development of CRA.
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U2 - 10.1016/j.ajo.2004.06.012
DO - 10.1016/j.ajo.2004.06.012
M3 - Article
VL - 138
SP - 612
EP - 619
JO - American Journal of Ophthalmology
JF - American Journal of Ophthalmology
SN - 0002-9394
IS - 4
ER -