PURPOSE: To compare the keratometry obtained from optical low-coherence reflectometry (Lenstar LS900®), autokeratometer (KR-8100®), and topography (Medmont E300®) in children. METHODS: A retrospective study was performed in 316 eyes of 160 subjects. Subjects were divided into 3 groups according to age. Group 1 was younger than 10 years, group 2 was older than 10 years and younger than 18 years, and group 3 was older than 18 years. Subjects were tested using the Lenstar LS900®, KR-8100®, and Medmont E300®. Comparisons were made for steep K, flat K, mean K, and astigmatism among three groups. Agreement among the 3 devices was examined using the Bland-Altman method. RESULTS: The keratometry measured by Medmont E300® was highest, followed by that of Lenstar LS900® and KR-8100® in all 3 groups. Almost all keratometry was significantly different among the 3 devices except for the flat K measured by LS900® and KR-8100® in all 3 groups and flat K measured by KR-8100® and Medmont E300® in Group 3 (p < 0.05). With regard to mean K, the agreement between Lenstar LS900® and KR-8100® was better than that between the other two pairs in both Groups 1 and 2, while agreement between Lenstar LS900® and Medmont E300® was better in Group 3. The agreement between KR-8100® and Medmont E300® was worse than that between the other two pairs in Groups 1 and 3, while the agreement between Lenstar LS900® and Medmont E300® was worse in Group 2. CONCLUSIONS: There were significant differences in keratometry among the 3 devices in all 3 groups. In children, Medmont E300® showed relatively less agreement compared with the other two devices. In adults, however, the agreement between 2 devices showed variable results. Consideration of the keratometry measurement from Lenstar LS900®, KR-8100®, and Medmont E300® might be helpful to estimate accurate corneal keratometry in children.
Adult ; Astigmatism ; Child* ; Humans ; Methods ; Retrospective Studies

PURPOSE: To compare the accuracy and clinical usefulness of different devices by measuring anterior chamber depth (ACD) with three devices and central corneal thickness (CCT) with four devices. METHODS: In 180 eyes of 90 healthy subjects, ACD was measured using A-scan, Lenstar LS900®, Pentacam®, and CCT was measured using ultrasound pachymetry (USP), Lenstar LS900®, Pentacam®, and anterior segment optical coherence tomography (OCT). RESULTS: The average ACT measurements using Lenstar LS900®, A-scan, and Pentacam® were 3.27 ± 0.35 mm, 3.26 ± 0.36 mm, and 3.25 ± 0.36 mm, respectively. The measurements were significantly correlated (p < 0.001) but without statistically significant difference (p = 0.017). The Bland-Altman plots showed a low degree of agreement. The average CCT measurements using Pentacam®, USP, Lenstar LS900®, and OCT were 553.31 ± 25.23 µm, 547.26 ± 23.83 µm, 541.38 ± 24.49 µm, and 531.40 ± 22.33 µm, respectively. The measurements were significantly correlated (p < 0.001) and statistically significantly different (p < 0.05). The Bland-Altman plots showed a low degree of agreement. CONCLUSIONS: ACD and CCT measured using different devices were highly correlated, but the ACD measurements were not statistically different; however, the CCT measurements were statistically different, and agreement was low between both measurements.
Anterior Chamber* ; Healthy Volunteers ; Tomography, Optical Coherence ; Ultrasonography

PURPOSE: To investigate the care patterns for radiation therapy and to determine inter-hospital differences for patients with laryngeal carcinoma in Korea. MATERIALS AND METHODS: A total of 237 cases of laryngeal carcinoma (glottis, 144; supraglottis, 93) assembled from 23 hospitals, who underwent irradiation in the year of 1998 and 1999, were retrospectively analyzed to investigate inter-hospital differences with respect to radiotherapy treatment. We grouped the 23 hospitals based on the number of new patients annually irradiated in 1998; and designated them as group A (> or =900 patients), group B (> or =400 patients and <900 patients), and group C (<400 patients). RESULTS: The median age of the 237 patients was 62 years (range, 25 to 88 years), of which 216 were male and 21 were female. The clinical stages were distributed as follows: for glottis cancer, I; 61.8%, II; 21.5%, III; 4.2%, IVa; 11.1%, IVb; 1.4%, and in supraglottic cancer, I; 4.3%, II; 19.4%, III; 28.0%, IVa; 43.0%, IVb; 5.4%, respectively. Some differences were observed among the 3 groups with respect to the dose calculation method, radiation energy, field arrangement, and use of an immobilization device. No significant difference among 3 hospital groups was observed with respect to treatment modality, irradiation volume, and median total dose delivered to the primary site. CONCLUSION: This study revealed that radiotherapy process and patterns of care are relatively uniform in laryngeal cancer patients in Korean hospitals, and we hope this nationwide data can be used as a basis for the standardization of radiotherapy for the treatment of laryngeal cancer.
Female ; Glottis ; Humans ; Immobilization ; Korea ; Laryngeal Neoplasms ; Male ; Retrospective Studies