Examining the eye with high resolution ultrasonography, authors encountered 34 cases(41 eyeballs) of cataractand found out its characteristic ultrasonographic findings, though cataract is easily recognized by physician oninspection. Ultrasonographic findings of cataract were as follows; 1. Thickening of lens due to edema. 2.Demonstration of lens echo in whole circumference. 3. Multiple internal lens echo.
Cataract ; Edema ; Ultrasonography

PURPOSE: To compare the effect of femtosecond laser-assisted cataract surgery with conventional cataract surgery on effective phacoemulsification time (EPT). METHODS: This study included 66 patients 100 eyes who underwent femtosecond laser-assisted cataract surgery and 68 patients 100 eyes who underwent conventional cataract surgery. Both groups underwent phacoemulsification using pulsed ultrasound energy and EPT was evaluated. The groups were further analyzed according to preoperative Lens opacities classification system (LOCS) III grading. Patients who had femtosecond laser-assisted cataract surgery underwent lens fragmentation with quadrant, hybrid, or grid pattern and the EPT was respectively evaluated. RESULTS: The mean EPT was 5.85 +/- 4.31 seconds in the femtosecond laser-assisted cataract surgery group and 10.34 +/- 6.61 seconds in the conventional group. Overall, EPT was statistically significantly lower in the femtosecond laser-assisted cataract surgery group compared to the conventional group. When the groups were analyzed according to LOCS III grading, this result was consistent for all cataract grades and the reduction in EPT was increased with the higher LOCS III grade. When the groups were analyzed according to lens fragmentation patterns, the mean EPT was lower with 350 microm grid pattern than the quadrant or hybrid pattern. CONCLUSIONS: The femtosecond laser-assisted system in cataract surgery can be an efficient cataract surgery using lower EPT compared to the conventional procedure. Additionally, significant differences were observed in the mean EPT of cataract surgery using the femtosecond laser-assisted system among the 3 lens fragmentation pattern groups.
Cataract* ; Classification ; Humans ; Phacoemulsification* ; Ultrasonography

PURPOSE: To compare the phacoemulsification time used in an adjunctive oscillation device and a conventional ultrasound phacomachine. METHODS: Thirty eyes had phacoemulsification with a NeoSoniX(R) (Alcon Infiniti phacoemulsification system, Alcon, TX, U.S.A.) tip, and 30 eyes had phacoemulsification with a conventional ultrasound tip. Using the Scheimpflug camera (EAS-1000, Nidek, Japan), densities of the lens were measured in the eye of each patient in both groups preoperatively. The setting of parameters for phacoemulsification in both groups was identical. The power was 19% and the vacuum setting was 180 mmHg. A pulse rate of 40 pulses per second was used. For the cataract surgery with NeoSoniX(R), the setting of the oscillation angle was fixed to 100% (4 degrees). After cataract extraction, the phacoemulsification time was recorded. RESULTS: The mean phacoemulsification time was 28.50+/-12.40 seconds in the NeoSoniX(R) group and 49.87+/-45.55 seconds in the conventional group. The reduced phacoemulsification time was statistically significant (p<0.05) in the NeoSoniX(R) group. CONCLUSIONS: There was a statistically significant difference of phacoemulsification time between the NeoSoniX(R) and conventional phacoemulsification groups. Therefore, NeoSoniX(R) may contribute to a reduction in phacoemulsification time in all applications and can be an effective adjunctive device in a conventional phacomachine.
Cataract ; Cataract Extraction ; Heart Rate ; Humans ; Phacoemulsification* ; Ultrasonography ; Vacuum

We measured the lens thickness and anterior chamber depth on 214 eyes (162 cataract eyes, 52 normal control eyes) using the EAS-1000 Scheimpflug camera. And the results was compared with measurement of A-scan ultrasonography in 49 cataract eyes. The thickness of cataract lens, especially in anterior subcapsular opacities in over 61 years old was significantly thin rather than control lens (p0.05). Lens thickness was increased with age by an annual rate of 0.0l5mm in monnal eyes (pcataract and there is differences between the measurement of Scheimpflug camera and that of A-scan ultrasonography.
Anterior Chamber ; Cataract* ; Humans ; Middle Aged ; Ultrasonography

PURPOSE: To evaluate the accuracy and the influencing factors of partial coherence interferometry in intraocular lens (IOL) power calculation for cataract surgery. METHODS: In 86 eyes of 69 patients who had undergone cataract surgery, we measured axial length using both IOLMaster and contact type ultrasonography, calculated the target refraction with SRK II formula and compared the result with the measured value after operation. We also evaluated the factors influencing the accuracy of the power calculation such as age, sex, type of cataract, severity of nucleosclerosis, corneal power, and preoperative refraction. RESULTS: In IOLMaster and contact type ultrasonography, the mean axial lengths were 23.70 +/- 1.27 mm and 23.55 +/- 1.28 mm (p<0.01), and the mean absolute errors (MAE) of refraction were 0.53 +/- 0.26D and 0.66 +/- 0.39D (p<0.01) respectively. The eyes of longer axial length showed larger MAE than those of shorter axial length (p=0.02). CONCLUSIONS: Partial coherence interferometry was more accurate than contact type ultrasonography in IOL power calculation. The factor associated with the accuracy of partial coherence interferometry was the axial length.
Cataract ; Humans ; Interferometry* ; Lenses, Intraocular* ; Ultrasonography

PURPOSE: To evaluation the accuracy of the IOL power calculation formulae measured by IOL Master(R) and applanation ultrasonography for the Tecnis ZCB00 IOL. METHODS: We performed a retrospective study of 170 eyes in 121 patients who underwent cataract surgery in our hospital with AMO Tecnis ZCB00 IOL.s. The SRK/T formula was used to predict the patient's implanted IOL power. Differences in the predicted refractive errors between IOL Master(R) and ultrasonography were analyzed and factors attributed to the differences were also analyzed. Three months after cataract surgery, mean numeric error and mean absolute error were analyzed. RESULTS: SRK/II and SRK/T formulas calculated using ultrasonography showed differences compared to the same formulas calculated using IOL Master(R), in which hyperopic shift was also demonstrated. No definite factor was attributed to the differences between the 2 methods. Although the 3 formulas of IOL Master(R) showed no significant difference in refractive errors, the SRK/T formula calculated using IOL Master(R) showed the least mean absolute and numeric errors. CONCLUSIONS: IOL Master(R) is considered more suitable when determining proper AMO Tecnis ZCB00 IOL power in cataract surgery. The hyperopic shift should be considered when calculating the IOL power using only ultrasonography.
Cataract ; Ultrasonography* ; Humans ; Lenses, Intraocular* ; Refractive Errors ; Retrospective Studies ; Ultrasonography

PURPOSE: To compare the axial lengths, anterior chamber depths, and keratometric measurements and to predict postoperative refractions of AL-Scan(R), IOL master(R), and ultrasound. METHODS: A total of 40 eyes in 30 patients who received cataract surgery were included in the present study. The axial length, anterior chamber depth, and keratometry were measured by 2 types of partial coherence interferometry (AL-Scan(R) and IOL master(R)) and ultrasound. The SRK/T formula was used to calculate IOL power, and the predictive error which subtracts predictive refraction from postoperative refraction was compared among the ocular biometry devices. RESULTS: Axial lengths were 23.08 +/- 0.62 mm, 23.09 +/- 0.62 mm, and 22.99 +/- 0.62 mm measured by AL scan(R), IOL master(R), and ultrasound, respectively. Axial length measured by ultrasound was statistically significantly shorter than AL scan(R) and IOL master(R) (p < 0.001, p < 0.001, respectively). The anterior chamber depth and keratometry were 3.11 +/- 0.06 mm and 44.82 +/- 1.34 D measured by AL scan(R), and 3.13 +/- 0.06 mm and 44.85 +/- 1.26 D measured by IOL master(R), respectively. The differences of anterior chamber depth and keratometry between the 2 devices were not statistically significant (p = 0.226, p = 0.331, respectively). The mean absolute prediction errors were 0.44 +/- 0.35 D, 0.40 +/- 0.34 D, and 0.39 +/- 0.30 D in AL-Scan(R), IOL master(R) and ultrasound, respectively, and were not statistically significantly different (p = 0.843, p = 0.847, p = 1.000, respectively). CONCLUSIONS: The ocular biometric measurements and prediction of postoperative refraction using AL-Scan(R) were as accurate as IOL master(R) and ultrasound.
Anterior Chamber ; Biometry* ; Cataract* ; General Surgery ; Humans ; Interferometry ; Ultrasonography

PURPOSE: To investigate the accuracy of intraocular lens power calculations using simulated keratometry (simK) of dual Scheimpflug analyzer and 5 types of formulas in cataract patients. METHODS: The keratometry (K), axial length (AXL) and anterior chamber depth (ACD) were measured using ultrasound biometry (USB) combined with auto-keratometry (Auto-K), parital coherence interferometry (PCI; IOL master®) and dual Scheimpflug analyzer (DSA; Galilei®) in 39 eyes of 39 patients. Predicted refraction was calculated using Auto-K, mean K of PCI, and simK and total corneal power (TCP) of DSA in the Sanders-Retzlaff-Kraff (SRK-T) formula. The SRK-II, SRK-T, Holladay II, Haigis, and Hoffer-Q formula were used to calculate predicted refraction with the simK of DSA and AXL of USB. Manifest refraction, mean numerical error (MNE) and mean absolute error were evaluated 1, 3 and 6 months after cataract surgery. RESULTS: TCP of DSA was lower compared with other keratometric values (p < 0.05). The MNE was not different among Auto-K, mean K and simK. The MNE using TCP was larger compared with Auto-K, mean K and simK at 1 month after surgery (p < 0.05). There was a difference in MNE between simK and TCP of DSA at 6 months after surgery (p < 0.05). The MNE of SRK-T formula was the smallest in the intraocular lens (IOL) power calculation using the simK of DSA. CONCLUSIONS: We suggest using IOL power calculations with simK of DSA and SRK-T formula rather than TCP of DSA in cataract patients with normal corneas.
Anterior Chamber ; Biometry ; Cataract ; Cornea ; Humans ; Interferometry ; Lenses, Intraocular* ; Ultrasonography

PURPOSE: Introduction of phacoemulsification and development of foldable artificial lens has facilitated smaller incisions, even micro-coaxial incisions. However, there have been several studies showing that micro-coaxial incision has no benefit compared with the conventional small incision method. Cases where Ellips ultrasound was used have not yet been reported. Therefore, we compared the postoperative results between 2.2-mm and 2.8-mm incision groups using Ellips ultrasound. METHODS: Among 49 eyes receiving cataract surgery from March, 2012 to August, 2012, 27 eyes in the 2.2-mm group and 22 eyes in the 2.8-mm group were examined to obtain cumulated dissipated energy (CDE), use of balanced salt solution (BSS), best-corrected visual acuity (BCVA), corneal endothelial cell count (ECC), corneal thickness at center and incision site, and keratometric astigmatism before and after surgery. RESULTS: There were no statistically significant differences between the 2.2-mm and 2.8-mm groups in CDE (2.5 +/- 2.0 vs. 2.5 +/- 2.3) and use of BSS (188 +/- 127 vs. 138 +/- 43 mL) during the surgery, BCVA (-0.45 +/- 0.62 vs. -0.55 +/- 0.79 log MAR), ECC (-178 +/- 210 vs. -99 +/- 114 cells/mm2), corneal thickness at center (23 +/- 23 vs. 27 +/- 23 microm) and incision site (24 +/- 19 vs. 27 +/- 19 microm) and keratometric astigmatism before and after the surgery. CONCLUSIONS: A 2.2-mm micro-coaxial incision using Ellips ultrasound showed no statistically significant differences in BCVA, ECC, corneal thickness at center and incision site, and keratometric astigmatism compared with 2.8-mm small incision.
Astigmatism ; Cataract* ; Endothelial Cells ; Phacoemulsification ; Ultrasonography* ; Visual Acuity

The effect of capsular tension ring[CTR]on prevention of contraction of capsular opening induced by continuous curvilinear capsulorhexis in cataract surgery has been evaluated. In this study, we performed cataract surgery on 15 patients[23 eyes]in Group I[IOL implantation with CTR] and 13 patients[24 eyes]in Group II[IOL implantation without CTR]from September 1998 to November 1998. We compared uncorrected visual acuity[UCVA], spherical equivalent[SE], astigmatism, size of capsular opening, IOL rotation and change of anterior chamber depth between two Groups. We used image analysis system to determine an actual size of capsular opening and measured a depth of anterior chamber than 5 times by using A-scan ultrasound. GroupIand IIshowed a similar pattern of change of UCVA, SE and astigmatism. Contraction rate of capsular opening 2 months after operation was 1.41%in Group Iand 3.95%in Group II. This difference was statistically significant [p<0.001].The anterior chamber depth increased temporarily in both groups, However, it was slightly decreased and maintained in Group I, while steadily decreased in Group II. Rotation of IOL was greater in Group IIthan Group I. However, it was not statistically significant. With these results it would be concluded that CTR might prevent a contraction of capsular opening and enhance a stability of IOL.
Anterior Chamber ; Astigmatism ; Capsulorhexis ; Cataract* ; Lenses, Intraocular* ; Ultrasonography