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Impressum
Changes of macular thickness and depth of anterior chamber in patients after filtration surgery.
Karasheva G., Klink T., Goebel W., Haigis W., Grehn F.
Universitaets-Augenklinik, Josef-Schneider Str. 11, 97080 Würzburg
Objective: To record and analyse retinal thickness of the macula
and depth of the anterior chamber in patients after filtration surgery
at different times of follow-up.
Methods: In 25 patients (25 operations, 22 with antimetabolites),
who underwent a filtering procedure, macular thickness of the fovea and
the extrafoveal area were measured using optical coherence tomography,
(OCT, Zeiss-Humphrey). Depth of the anterior chamber was determined using
the IOLMaster (Carl Zeiss Jena). All patients underwent a standard eye
examination, including intraocular pressure (IOP) and best-corrected visual
acuity measurements. Examinations were performed before the operation,
at 1-3 days, 1 week, 1 month and 3 months after surgery.
Results: All 25 patients completed the 1 month follow-up examination
and 7 patients already completed the 3 months follow-up. Preoperative
IOP under medication was 24.0±6.9 mmHg. After 1-3 days IOP without
medication was reduced to 11.0±6.1 mmHg, after 1 week to 11.8±5.8
mmHg and after 1 month 12.0±5.0 mmHg respectively. IOP was lowered
significantly at all postoperative follow-up examinations (p<0,0001).
5 patients had postoperative hypotony (IOP<5) in the postoperative
period. Central macular thickness changed from 164±18 µm
before the operation to 172±17µm after 1-3 days, 168±18µm
after 1 week and 175±25µm after 1 month. The foveal thickness
at the 1-3 day and 1 month measurements was significantly higher than
preoperatively (p=0,02). The mean thickness of the extrafoveal retina
did not change significantly. There was no correlation between reduction
of IOP and retinal thickness. Furthermore, no significant correlation
was found between changes of IOP and anterior chamber depth.
Conclusion: In our prospective study, we did not find a significant
correlation between reduction of IOP and retinal thickness nor with anterior
chamber depth. With the surgical technique used, postoperative hypotony
did not lead to thickening of macular area or shallowing of the anterior
chamber.