| PurposeUltrasound biomicroscope (UBM) was designed and produced by Palvin in 1990. UBM had a high frequency transducer (50MHz) and can obtain eight tomographic images per second. Its lateral and axial resolution was 50 )J m and penetration distance was 4 to 5mm. In addition, UBM is non-contact, non-invasive and non-interference. It was an useful diagnostic tool in ophthalmology. In this study, Ultrasound biomicroscopy was performed in eyes with cataract extraction and PC IOL implantation to evaluate the changes of anterior-segment structures, to measure the decentration and tilt of optics, accurately to locate the haptics, to observe the effect of haptics on uveal tissues , and to analyze the cause of complications.MethodThis study comprised 50 patients (50 eyes) who had cataract surgery and PC IOL implantation. Examination of visual acuity, introcular pressure, anterior segment and fundus and evaluation with UBM were performed preoperatively and at 1 week and 3 months postoperatively in all patients.Result1. The prognosis of visual acuity was satisfactory. The best corrected visual acuity improved in all patients. The mean IOP was 16.72 ?O.SlmmHg preoperatively, and 17.58 ?O.SlmmHg at 1 week and 16.57 ?.62mmHg at 3 months after surgery. The difference was not statistically significant( P>0.05 ) .There were two patients who had IOP great than 21 mmHg at 1 week postoperatively.2. Aqueous flare was observed in 9 eyes ( 18% ) at 1 week after surgery and disapperad at 3 months after surgery. There was no correlation between aqueous flare and location of PC IOL ( P>0.05 ) .3. Postoperatively the anterior chamber depth and the degree of anterior chamber angle were greater than preoperative values. The difference was statistically significant (p<0.05). There was no significant difference between preoperative and postoperative corneal thickness (P>0.05).4 Both haptics were located in the bag in 72% of eyes, both haptics were in ciliary sulcus in 12%, and one haptic in ciliary sulcus and the other in capsule were in 16%.5 Mild tilt of optic was occurred in one eye (2%) at 1 week after surgery who had an asymmetric implantation of PC IOL.6. At 1 week after surgery, peripheral iris tuck was observed in 2 eyes (4%), and ciliary sulcus erosion in 3 eyes (6%). There was correlation between ciliary sulcus erosion and inflammation reaction in the anterior chamber (P<0.01).7. At 1 week after surgery, residual cortex was observed in 5 eyes (10%), and there was no correlation between residual cortex and inflammatory reaction in anterior chamber (P>0.05).Conclusions1. The depth of anterior chamber and the degree of anterior chamber angle increased after cataract surgery and PC IOL implantation.2. The haptics of PC IOL can be located in the bag, in the ciliary sulcus or one in ciliary sulcus and the other in the bag.3. Optics tilting can occur soon after surgery due to asymmetric implantation of PC IOL.4. Peripheral iris tuck and ciliary sulcus erosion can be observed afer surgery. These effect was correlated to the diameter of PC IOL and elasticity of haptics .5. There was correlation between ciliary sulcus erosion and inflammatory reaction in anterior chamber.6. Small amount of residual cortex after surgery had no clinical significance. |
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