• Journal of Preventive Medicine and Public Health
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• 제27권4호
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• pp.807-814
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• 1994

This study is to find out changes in medical practice at a university hospital before and after covering intraocular lens (IOL) from the health insurance benefit. The coverage started on March 1, 1993 and a total of 596 cases who were discharged from July 1 to December 31, 1992 and 580 cases who were discharged from July 1 to December 31, 1993 were analyzed. Since the standard reimbursement scheme was changed from March 1, 1993, the charges for 1992 were transformed into 1993 scheme. Major findings are as follows: Average length of stay was statistically significantly decreased from 8.24 days in 1992 to 6.86 days in 1993. Charges except IOL has been statistically significantly decreased from 501,000 Won in 1992 to 444,000 Won in 1993. Charges for drugs and injection have been reduced. However, charge per day for them was not much different. This is due to decrease in length of stay. Charges for laboratory tests and radiologic examination were quite the same. Charges which are not covered by the insurance remained the same. The revenue of the hospital was reduced as expected. However, the hospital reduced the length of stay and increase the turnover rate In order to compensate the potential loss of revenue due to the difference of reimbursement between the out-of-pocket expense and the insurance coverage. By introducing the IOL benefit in the insurance, the insured pays less, hospital generates more revenue through shortening the hospital stay, and the total medical care cost becomes less nationwidely.

• 한국인터넷방송통신학회논문지
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• 제14권4호
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• pp.173-179
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• 2014

오늘날 한국 사회에서 백내장 수술은 가장 빈번하게 이루어지는 수술중 하나이다. 백내장을 치료하기 위한 방법은 다양하게 발전해왔다. 이 중 오늘날 널리 쓰이는 방식은 인공 수정체를 이용하여 기존의 수정체와 교환하는 방법이다. 인공 수정체 삽입 시 미리 계산된 지점 및 각도로 정확하게 삽입하는 것이 중요할 수 있는 지점 표시가 필요 하다. 그러나 수술 중에 눈에서 분비되는 이물질 같은 요인에 의해 표시가 지워질 수 있다. 그러므로 이런 표시방법을 실시간으로 카메라 영상을 받음으로써 영상처리로 추적하는 방법이 필요하다. 본 논문에서는 템플릿 매칭과 버퍼를 이용한 특징점 추적 방법을 제안한다. 제안한 방법을 적용함으로 해당 수정체 삽입 위치를 정확히 추적하는 것을 확인하였다.

• Journal of Yeungnam Medical Science
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• 제6권1호
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• pp.81-86
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• 1989

1986년 1월부터 1988년 4월까지 본대학 안과학교실에서 시행한 26례의 수정체후낭적출술 및 전방렌즈 삽입술 중 planned ACL 15례와 unplanned ACL 11례를 대상으로 Goldmann applanation tonometer를 사용하여 안압을 측정하고 각 요인에 따라 수술전과 수술후 안압의 차이를 비교 분석하여 보았던 바 다음과 같은 결론을 얻었다. 1. 술전 안압과 술후 안압에 대한 통계학적 유의성은 양군 모두 없었다. 2. planned ACL군에서는 53.4%, unplanned ACL군에서는 54.5%에서 안압상승이 있었으나 두군 모두 정상범위내로 안압차이에 대한 통계학적 유의성은 없었다. 3. 안압변화의 평균치는 planned ACL군에서 1.07mmHg의 상승이 있었고 unplanned ACL군에서는 0.18mmHg의 안압하강이 있었다. 4. 각 군의 나이 분포도에 대한 양군간의 안압변화에 대한 유의성은 없었다. 5. 술후 3개월이 경과한 뒤의 안압 변화는 술전 안압과 비교하여 양군 모두 통계학적 유의성은 없었다.

• Journal of the Optical Society of Korea
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• 제18권2호
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• pp.110-117
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• 2014

In this study, we objectively determined whether the ReSTOR as a multifocal IOL (intraocular lens) has a multifocal function compared to the IQ as a monofocal IOL in vivo by OQAS (Optical Quality Analysis System). Eighteen patients who had cataract surgery with implantation of ReSTOR (27 eyes) and 15 patients with IQ (21 eyes), were included inthis study. Uncorrected distance visual acuity (UCDVA), corrected distance visual acuity (CDVA), uncorrected near visual acuity (UCNVA)and distance corrected near visual acuity (DCNVA) were measured. After setting the artificial pupil size to 3 mm, we performed 'Optical quality'. We inputted defocus diopters of (objective spherical refraction)(far), (objective spherical refraction-1.25 D)(intermediate),(objective spherical refraction-2.5 D)(near), and (objective spherical refraction-3.5 D)(very near) into 'selected spherical refraction' simulating the optical quality at far, intermediate, and near distance. We changed the pupil size to 5 mm and repeated the same measurements. The UCDVA and CDVA did not show significant differences between the 2 groups. But, the UCNVA and DCNVA of the ReSTOR group were better than those of the IQ group (p=0.000, p=0.000). For 3 mm pupil, at far distance, modulation transfer function (MTF) cut off and point spread function (PSF) width at 50% of ReSTOR were worse than those of IQ (p=0.039, p=0.020). At intermediate distance, MTF cut off, Strehl ratio and PSF width at 50% of ReSTOR were worse than those of IQ (p=0.001, p=0.001, p=0.000). At near distance, MTF cut off of ReSTOR was worse than that of IQ (p=0.033). At very near distance, MTF cut off and Strehl ratio of ReSTOR were worse than those of IQ (p=0.002, p=0.002), but PSF width at 50% of ReSTOR was better than that of IQ. For 5 mm pupil, most parameters at each distance, there was no significant difference between the 2 groups. Only PSF width at 50% of ReSTOR were worse than those of IQ at intermediate distance (p=0.013). It was impossible to show the multifocal function of ReSTOR compared to the IQ byOQAS.

• Macromolecular Research
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• 제16권7호
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• pp.614-619
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• 2008

Copolymers of phenyl alkyl acrylates/methacrylates are used clinically as soft materials for the foldable intraocular lens (IOL) to treat cataracts. In this study, copolymers of 2-phenylethyl acrylate (PEA) and 2-phenylethyl methacrylate (PEMA) of various compositions were prepared using free radical polymerization in solution. The composition of the copolymers was determined by $^1H$-NMR analysis. The reactivity ratios of the monomers were calculated using the conventional Fineman-Ross or Kelen-Tudos method. The reactivity ratio of PEA ($r_1$) and PEMA ($r_2$) were estimated to be 0.280 and 2.085 using the Kelen-Tudos method, respectively. These values suggest that PEMA is more reactive in copolymerization than PEA, and the copolymers will have a higher content of PEMA units. The glass transition temperature ($T_g$) of the copolymers increased with increasing PEMA content. The molecular weight and polydispersity indices ($M_w/M_n$) of the polymers were determined by GPC. Overall, these results are expected to be quite useful in applications to foldable soft IOL materials.

• 대한안과학회지
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• 제59권12호
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• pp.1185-1189
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• 2018

목적: 위수정체안에서 외상에 의하여 발생한 단독 무홍채증 1예를 경험하였기에 이를 보고하고자 한다. 증례요약: 69세 여자 환자가 계단에서 넘어져 우안 수상 후 우안 안구통 및 시력저하를 주소로 응급실에 내원하였다. 5년 전 본원에서 우안 이측 2.2 mm 투명각막절개창을 통해 백내장수술을 받은 환자였다. 백내장 창상 부위를 통하여 전체 홍채해리가 탈출되었으나 창상이 벌어지거나 후낭, 인공수정체의 손상은 없었다. 결론: 저자들은 국내에서 보고된 바 없는 증례인 위수정체안에서 외상에 의하여 발생한 단독 무홍채증 1예를 경험하였기에 이를 보고하는 바이다.

• International Journal of Advanced Culture Technology
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• 제9권3호
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• pp.212-220
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• 2021

Method : Using annual statistics of major surgeries provided by the National Health Insurance Corporation, it figured out what changes come in visual acuity by the number of cataract surgeries nationwide plus age, gender, and geriatric disease every 3 years from 2013 to 2019 through joint point regression for statistics. Objective : This study is intended to identify the relationship between geriatric diseases (diabetes, hypertension, obesity) and visual acuity in geriatric cataract surgery patients. Result : First, geriatric diseases of cataract surgery patients were closely related to diabetes, hypertension, obesity, smoking, and drinking. In particular, diabetes, hypertension, and smoking had a high prevalence rate. There was no difference in gender and age. Second, 72% of all geriatric cataract surgeries were performed at the clinic level, and intraocular lens that was used after geriatric cataract surgery accounted for the majority of monofocal intraocular lens as 96.6%. Third, the visual acuity in geriatric cataract surgery patients improved from an average of 0.40 before surgery to 0.06 after surgery, and visual acuity improvement was found in 95% of them. These results suggest that geriatric cataract patients can expect visual acuity stabilization and positive visual acuity improvement through early surgery.

• Korean Journal of Ophthalmology
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• 제32권6호
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• pp.497-505
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• 2018

Purpose: To evaluate and compare published methods of calculating intraocular lens (IOL) power following myopic laser refractive surgery. Methods: We performed a retrospective review of the medical records of 69 patients (69 eyes) who had undergone myopic laser refractive surgery previously and subsequently underwent cataract surgery at Samsung Medical Center in Seoul, South Korea from January 2010 to June 2016. None of the patients had pre-refractive surgery biometric data available. The Haigis-L, Shammas, Barrett True-K (no history), Wang-Koch-Maloney, Scheimpflug total corneal refractive power (TCRP) 3 and 4 mm (SRK-T and Haigis), Scheimpflug true net power, and Scheimpflug true refractive power (TRP) 3 mm, 4 mm, and 5 mm (SRK-T and Haigis) methods were employed. IOL power required for target refraction was back-calculated using stable post-cataract surgery manifest refraction, and implanted IOL power and formula accuracy were subsequently compared among calculation methods. Results: Haigis-L, Shammas, Barrett True-K (no history), Wang-Koch-Maloney, Scheimpflug TCRP 4 mm (Haigis), Scheimpflug true net power 4 mm (Haigis), and Scheimpflug TRP 4 mm (Haigis) formulae showed high predictability, with mean arithmetic prediction errors and standard deviations of $-0.25{\pm}0.59$, $-0.05{\pm}1.19$, $0.00{\pm}0.88$, $-0.26{\pm}1.17$, $0.00{\pm}1.09$, $-0.71{\pm}1.20$, and $0.03{\pm}1.25$ diopters, respectively. Conclusions: Visual outcomes within 1.0 diopter of target refraction were achieved in 85% of eyes using the calculation methods listed above. Haigis-L, Barrett True-K (no history), and Scheimpflug TCRP 4 mm (Haigis) and TRP 4 mm (Haigis) methods showed comparably low prediction errors, despite the absence of historical patient information.

• 한국임상수의학회지
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• 제32권1호
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• pp.130-134
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• 2015

A 13-year-old, castrated male Yorkshire terrier was presented with acute blepharospasm 2 months after phacoemulsification with intraocular lens implantation in the left eye. Menace response was weakly positive in the left eye. Intraocular pressure (IOP) was 98 mmHg in the left eye. On ophthalmic examination using slit lamp biomicroscope, episcleral injection and corneal edema were observed in the left eye. Aqueous flare (1+) and iris bombe with peripheral anterior synechia were also detected in the left eye. In spite of medical treatments, IOP was remained more than 50 mmHg. Synechiolysis and radial iridectomy with irrigation/aspiration of anterior chamber were performed in the left eye. One week after the surgery, tissue plasminogen activator was injected to resolve the blood and fibrin clot in the left anterior chamber. Menace response was recovered completely 1 month after the surgery and IOP was maintained less than 20 mmHg more than 6 months.

• Journal of Yeungnam Medical Science
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• 제24권2호
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• pp.243-251
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• 2007

비외상성의 수정체 이탈 환자에서 윤부 수정체절제술을 시행하는 경우, 초음파유화술 후 수정체낭 겸자를 이용하여 수정체낭을 모두 제거하고 앞유리체절제술을 시행하는 경우와 시행하지 않는 경우에 따라 시력예후 및 술후 합병증 발생에 미치는 영향에 대해 알아보고자 20명(33안)의 환자를 대상으로 술전 및 술후 합병증 발생에 대해 통계적으로 분석하였다. 앞유리체절제술을 시행한 I군(18명, 27안)과 앞유리체절제술을 시행하지 않은 II군(5명, 6안)으로 나누었으며, 술 후 두 줄 이상의 시력의 호전이 있는 경우를 호전의 지표로 삼았다. 술전과 비교하여 술후에 시력 호전이 있었던 경우가 I군은 27안 모두에서, II군은 6안중 5안에서 있었으나 두 군간에 유의한 차이는 없었다(p>0.05). 술후 합병증은 I군에서 인공수정체의 이탈이 4안(14.8%), 유리체 출혈이 2안(7.4%), 안내염이 1안(3.7%)에서 발생하였으며, II군에서 유리체 탈출이 1안(16.7%), 안압상승이 1안(16.7%)에서 발생하였으나, 두 군 모두에서 가장 시력을 위협하는 합병증인 망막박리는 발생하지 않았다. 비외상성 수정체 이탈의 치료로 수술적 치료의 적응증에 해당하는 경우 윤부 수정체절제술과 인공수정체 공막고정술을 시행하면 수술결과와 술후 합병증 면에서 좋은 수술술기가 될 것으로 사료되며, 앞유리체절제술은 유리체 탈출 등이 없다면 반드시 시행하지 않아도 수술결과에 영향을 주지 않을 것으로 생각된다.