Young Woo Seo

This letter proposes a multiple-mode Kalman filter for one-dimensional attitude estimation using low-cost accelerometer and gyroscope. The nonlinearity and time-varying parameters are partitioned into several modes; for each mode, a linear time-invariant Kalman filter is selected. Experimental results are given to verify the proposed Kalman filter

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BACKGROUND: To investigate the accommodative loads change needed to maintain binocular fusion in patients with intermittent exotropia (IXT). METHODS: Seventeen consecutive patients with basic IXT and 15 normal controls were recruited. The WAM-5500 autorefractor (GrandSeiko, Fukuyama, Japan) was used to measure refractive error (D) under binocular and monocular viewing conditions at 6 m, 50 cm, 33 cm and 20 cm. The difference between binocular and monocular refractive error (D) at each distance d

목적: 눈 피로를 객관적으로 평가할 수 있는 방법에 대해 알아보고자 한다. 대상과 방법: 건강한 성인 15명을 대상으로 정해진 컴퓨터 작업을 1시간 시행하여 눈 피로를 유발한 후 설문조사로 작업 전후 주관적인 눈 피로를 평가하였다. 객관적인 눈 피로 평가 방법은 눈물막 파괴시간, 눈보호지수, 결막 충혈도, 눈 깜빡임 없이 참을 수 있는 최대 시간, 안구표면온도, 폭주 및 개산 융합력, 시유발전위도를 작업 전과 직후에 비교 측정하였으며, 눈둘레근 표면근전도는 작업 전 5분 간과 작업 동안 시행하여 변화를 분석하였다. 결과: 피검자 모두 작업 후 주관적인 눈 피로도 증가를 보였다. 작업 후 눈물막 파괴시간, 눈보호지수, 눈 깜빡임 없이 참을 수 있는 최대 시간이 유의하게 감소하였으며, 안구표면온도는 유의하게 증가하였다(P＜0.05). 결론: 눈물막 파괴시간, 눈보호지수, 눈을 깜빡이지 않고 참을 수 있는 최대 시간, 안구표면온도가 눈 피로를 객관적으로 평가하는 데 사용될 수 있겠다.

PURPOSE: To evaluate the effect of classroom illuminance on the development and progression of myopia in elementary school children. METHODS: The daylight factor, a ratio of inside and outside illuminance, was obtained in 50 elementary schools. The firstgrade students in the school with the lowest daylight (LD) factor (LD school, 145 subjects; 0.51%) and with the highest daylight (HD) factor (HD school, 147 subjects; 13.35%) were selected. A survey was conducted to evaluate parental myopia, the

PURPOSE: The purpose of this paper is to investigate how much correction is obtained per millimeter of medial rectus (MR) resection for recurrent exotropia after bilateral lateral rectus (BLR) recession, and to determine the difference in the effects between unilateral and bilateral resection, and the influence of previous lateral rectus (LR) recession on the effects of MR resection. METHODS: A total of 59 patients who had undergone MR resection after BLR recession were included in this study. T

This study was performed to compare the incidence of posterior capsular opacity (PCO) and refractive errors between hydrophilic (ACR6D, Corneal) and hydrophobic (MA60BM, AcrySof) acrylic intraocular lenses (IOLs) over a 3-year follow-up after phacoemulsification surgery. The patients with AcrySof implanted in one eye and Corneal in the other eye were categorized as Group 1 (n=28), while those with one or both eyes implanted with IOLs of the same kind were categorized as Group 2 (AcrySof, n=90; C

Viewing 3D images with crossed disparity induced a greater degree of NITM than 2D images. These results suggest that the greater NITM induced by 3D images may have a greater effect on the development and progression of permanent myopia.

Nocturnal ambient light exposure increases ocular fatigue. Avoiding ambient light during sleep could be recommended to prevent ocular fatigue.

Papilledema can occur as a manifestation of STAT3 gain-of-function mutation, sometimes accompanied by prominent vascular sheathing and cystoid macular edema. The mechanism may be chronic meningeal infiltration by white blood cells, impairing cerebrospinal fluid absorption.

Purpose: The purpose of this paper is to investigate how much correction is obtained per millimeter of medial rectus (MR) resection for recurrent exotropia after bilateral lateral rectus (BLR) recession, and to determine the difference in the effects between unilateral and bilateral resection, and the influence of previous lateral rectus (LR) recession on the effects of MR resection. Methods: A total of 59 patients who had undergone MR resection after BLR recession were included in this study. T

PURPOSE: To investigate the association between vision improvement with refractive correction in the visually impaired eyes and the prevalence of ocular comorbidities in the South Korean population. MATERIALS AND METHODS: The data of 24,620 individuals in the Korea National Health and Nutrition Examination Survey (KNHANES 2009-2011) were reviewed. Visual impairment was defined as a presenting visual acuity < 20/60. The participants with visual impairment in at least one eye were divided into 3 g