No abstract available.
Ultrasonics

No abstract available.
Ultrasonics*

No abstract available.
Ultrasonics*

No abstract available.
Ultrasonics

Ultrasonic pachymetry was carried out in 300 eyes of normal, myopic, and senile cataract patients with Alcon Surgical Pachymeter. The mean central corneal thickness was 0.527mm+/- 0.034mm. Corneal thickness wa significantly correlated with age, axial length, and sex. No statistical correlation was found between corneal thickness and the right or left eyes, corneal curvature, and ocular tention (within normal range). Pachymetric results were consistent if a good applanation of the probe occurred. Thus, reliable data could only be obtained by skilled user.
Ultrasonics ; Eye

No abstract available.
Lipectomy* ; Ultrasonics*

No abstract available.
Osteotomy ; Ultrasonics

PURPOSE: The purpose of this study was to evaluate the effect of transscleral pressure on the thickness and hydration of the human sclera. METHODS: Scleral sections excised from moist-chamber-stored human globes were mounted in a perfusion chamber that can create transscleral pressure. The scleral thickness was measured at 15-minute intervals using ultrasonic pachymetry with pressure changes of 15, 30, and 60 mmHg every 2 hours. The scleral hydration was measured by maintaining a constant pressure (15, 30, and 60 mmHg) for 4 hours, weighing the hydrated tissue, then drying for 24 hours at 120degrees C, and finally weighing the dry tissue. RESULTS: The changes of scleral thickness from the initial control thickness in the 7-mm perfusion chamber (n=6) were -0.38+/-2.11%, 0.26+/-2.99 %, and -3.92+/-3.40% at 15, 30, and 60 mmHg, respectively. In the 10-mm perfusion chamber (n=5), the thickness changes were -0.56+/-1.35%, -1.05+/-1.63%, and -2.71+/-1.60% at 15, 30, and 60 mmHg, respectively. Scleral thickness was slightly decreased with the increase of transscleral pressure. There was a statistically significant decrease in scleral thickness from 30 mmHg to 60 mmHg in the 7-mm perfusion chamber (p<0.05). Changes of the scleral hydration value in the 7-mm perfusion chamber were -0.79+/-1.06% (n=5), 0.66+/-1.40% (n=5), and 0.05+/-1 . 3 0 % (n=5) at 15, 30, and 60 mmHg, respectively. There were no statistically significant changes in the scleral hydration with transscleral pressure change of 0~60 mmHg (p>0.10). CONCLUSIONS: The scleral hydration remained essentially unchanged with the transscleral pressure change of 0 ~ 60 mmHg, whereas the scleral thickness showed a slight decrease with the increase of transscleral pressure. Further histologic studies will be needed to assess the ultrastructural change of human sclera in the future.
Humans* ; Perfusion ; Sclera ; Ultrasonics

PURPOSE: To evaluate the effect of dry eye on the corneal thickness measured by Orbscan and ultrasonic pachymetry. METHODS: The central corneal thickness was measured by both ultrasonic and Orbscan pachymetry in 30 eyes with dry eye (dry eye group) and in 30 eyes of normal subjects (control group). Dry eye was diagnosed when a Schirmer test result was less than 10 mm (after topical anesthesia) and the test for tear osmolarity was also performed. RESULTS: Tear osmolarity was 364.4+/-42.9 mOsm/L in dry eye group and 337.8+/-34.5 mOsm/L in control group. It was significantly higher in dry eye group than in the control group (p=0.011). Mean central corneal thickness measured by Orbscan pachymetry was 547.5+/-27.3 microgram in dry eye group and 562.0+/-20.4 microgram in the control group. It was significantly thinner in dry eye group than in the control group (p=0.023). Mean central corneal thickness measured by ultrasonic pachymetry was 535.7+/-27.2 microgram in dry eye group and 547.6+/-20.1 microgram in the control group with out significant difference between the two groups (p=0.059). CONCLUSIONS: The corneal thickness measured by ultrasonic pachymetry is less affected by dry eye compared to that measured by Orbscan pachymetry.
Osmolar Concentration ; Ultrasonics*

Doppler ultrasound had been used for measuring kidney blood flow circulating KBFC on 360 subjects (720 kidneys). Depending on the age, in young men of control group, KBFC of male subject 1164.620 ± 184.932 ml/minute, of female 1235.00 ± 194.795 ml/minute, in both 2 gender 1199.811 ± 192.144 ml/minute. In comparing with the control subjects, the KBFC began to vary, decreased 6.91% in medium age subjects, in the senil subjects the decrease was obvious 11.79%, in the elderly: very obvious 27.27%. The age had had a strictly negative relation to KBFC variation.
Ultrasonics ; Aged ; Blood