Objective To measure the changes of eye shape and axial length of the eyeball before and after removing the scleral encircling buckles.Methods This is a prospective and controlled study. Twenty eyes (20 patients) with rhegmatogenous retinal detachment and the fellow eyes were enrolled in this study. All patients underwent scleral encircling buckling, and the buckles were removed 2.0-3.5 years after the surgery. The eye shape and axial length of both eyes were measured by three-dimensional computed tomography (3D-CT) before and one,three,six months after the removing surgery. The axial length was also measured by intraocular lens (IOL) Master.Results 3D-CT showed that buckled eyeball depressed at the equator, resulting in a gourd-shaped eyeball. One month after removing the encircling buckle the depression disappeared. By 3D-CT scanning, the axial lengths of buckled eyes were (27.65plusmn;1.22), (27.3plusmn;1.56), (27.29plusmn;1.46) and (27.12plusmn;1.49) mm before and one, three, six months after the removing surgery respectively. The difference between before and after removing surgery was not statistically significant (t=2.89,P=0.723). By IOLMaster, the axial length of operated eyes were (28.32plusmn;1.94), (28.17plusmn;1.87), (28.21plusmn;1.94), (28.25plusmn;1.93） mm respectively. The difference between before and after removing the encircling band was not statistically significant (t=3.304, P=0.93). There was no significant difference in these two measuring modes (t=3.705,P=0.847).Conclusions Encircling buckling can cause eyeball indentation, removing the encircling band can rescue the indentation. There are no changes in the axial length before and after removing the encircling buckles.
Objective To detect the value of three-dimensional (3D) ultrasound diagnosis in common ocular fundus diseases. Methods Two-dimensional (2D) images of 38 patients with common ocular fundus diseases were three-dimensionally reconstructed via 3D ultrasound workstation. The 3D images reflecting the ocular diseases were analyzed. Result In 38 patients with common ocular fundus diseases, there was vitreous hemorrhage in 16 patients, retinal detachment in 12, choroidal detachment in 5, and intraocular space occupying lesion in 5. Compared with the 2D images, 3D reconstructed images reflect the lesions more intuitionistically, displayed the relationship between the lesions and the peripheral tissues more clearly, and revealed the blood flow more specifically. During a scanning examination, 3D reconstructed technology provided the diagnostic information of section of X, Y and Z axises simultaneously which shortened the time of examination; the condition of any point of lesions and the relation between the lesion and the peripheral tissues could be gotten by the tools like cut and chop provided by 3D imaging software itself, which avoided detecting the same lesion with different angles and lays and proved the diagnostic efficacy. Conclusions 3D ultrasound diagnosis is better than 2D in diagnosis of vitreous, retina, choroid, and intraocular space occupying lesion. 3D ultrasound diagnosis is a complementarity for the 2D one, and the Z axis changes the former observational angles which may provide the new way of precise diagnosis. (Chin J Ocul Fundus Dis, 2005, 21: 381-383)