• Journal of Korean Ophthalmic Optics Society
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• v.18 no.2
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• pp.101-106
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• 2013

Purpose: This research was to evaluate the sterilization effectiveness for bacterial contamination by general cleaning method of glasses for vision correction. Methods: From 82 eyeglass wearers the number of bacteria before and after cleaning was counted to check the status of the eradication. Results: The results after ultrasonic cleaning by using the tap water did not showed change of bacterial species. Ultrasonic cleaning using the 70% rubbing alcohol showed cleaning of 46.2% of bacteria. Ultrasonic cleaning using the 70% rubbing alcohol after brushing with general detergent showed clearing of 85.7% of bacteria. Conclusions: When glasses were brushed with a detergent, opportunities infectious bacteria in glasses for vision correction were removed effectively. These results can be suggested as a guideline for management of clean glasses.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.1
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• pp.31-40
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• 2011

Purpose: This study was performed to investigate the actual state about ultrasonic cleaning of soft contact lenses in local optical shops and evaluate the removal effect of protein deposit on soft contact lenses with different lens containers by ultrasonic cleaner for eyeglasses. Methods: The actual state about ultrasonic cleaning of soft contact lenses was surveyed in total 75 local optical shops in Seoul, Korea. The cleaning efficacy of different lens containers was compared by measuring the protein remained on ocufilcon D contact lenses after washing by an ultrasonic cleaner for eyeglasses. The changes on surfaces and wetting angles of ocufilcon D contact lenses by repeat ultrasonication were further investigated. Results: The main purpose to use ultrasonic cleaners in local optical shops was rapid cleaning. The ultrasonic cleaning efficacy of ocufilcon D contact lenses with glass containers was little higher than it with plastic containers, but was not significantly different. The changes on surfaces and wetting angles of ocufilcon D contact lenses in a plastic lens container by repeat ultrasonication such as 30 and/or 60 times were shown. Conclusions: There was not significant difference in cleaning efficacy between glass and plastic lens containers. However, repeat cleaning with ultrasonic cleaner for eyeglasses would be carefully considered since some significant changes in the parameters of lens surface and wetting angles were detected by repeat ultrasonification even when lens containers were used for ocufilcon D contact lens during ultrasonictions.

• Journal of Korean Ophthalmic Optics Society
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• v.15 no.3
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• pp.227-234
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• 2010

Purpose: The cleaning effect of protein deposit and the change of contact lens parameters by ultrasonic cleaner for eye glasses on the soft contact lenses were investigated. Methods: Etafilcon A contact lenses contaminated with protein, was ultrasonicated by ultrasonic cleaner for eye glasses and for the control group, spoiled contact lenses were cleaned by multi-purpose solution. The remaining protein deposits on the contact lenses were determined after extraction and the changes of overall diameter, base curve, center thickness power, and water contents on contact lenses were measured and surfaces of contact lenses were observed by scanning electron microscope. Results: The cleaning efficacies of multi-purpose solution on protein deposited etafilcon A contact lenses were 6.08%, and 23.73~33.92% in the group of ultrasonic cleaner for eye glasses with multi-purpose solution and 0~12.99% in the group of ultrasonic clear for contact lens with multipurpose solution depending on the treatment time. The changes of parameters and surface on contact lenses by ultrasonication were not observed. Conclusions: Ultrasonic cleaner for eye glasses can be used to eliminate protein deposits for the diagnostic soft contact lens in the office since it was effective to eliminate protein deposits and not caused change of parameters on soft contact lenses.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.4
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• pp.391-401
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• 2011

Purpose: In the present study, the actual management state of trial contact lenses and lens care products in local optical shops was surveyed and analyzed to reduce the risk of lens complication possibly induced by neglecting lens care. Methods: The feeling of contact lens wearers during the wear of trial contact lenses was surveyed. Futhermore, the actual management state of trial contact lenses such as cosmetic lens and RGP lens and lens care products was also investigated by surveying opticians who trade contact lenses in local optical shops. Results: It was found that consumers trusted the sanitary conditions of the lens since trial cosmetic contact lens and RGP lens were cleaned before and after trails by over 98% of opticians in local optical shops. For trial cosmetic lens, cleaning with normal saline, multipurpose solution for soft lens and combination of saline and multipurpose solution were 38.5%, 40.5% and 21%, respectively, before trials. After trials, cosmetic lenses were cleaned with normal saline, multipurpose solution for soft lens and a combination of saline and multipurpose solution were 13%, 75%, and 12%, respectively. On the other hand, cleaning with normal saline, multipurpose solution for RGP lens and combination of saline and multipurpose solution were 28.5%, 38.5% and 33%, respectively, before trying trial RGP lens. After trials, RGP lenses were cleaned with normal saline, multipurpose solution for RGP lens and a combination of saline and multipurpose solution were 2.5%, 70%, and 27.5%, respectively, indicating that relatively many opticians followed the lens cleaning regimen. In local optical shops, the cleaning trial cosmetic lens was mainly conducted at every 10 days or a month and the washing cycle of cosmetic lens case was in a month or 2~3 months. The cleaning interval of trial RGP lens was primarily in a month or 2~3 months. For those lens cases, more than 75% of opticians washed them with a surfactant and then rinsed with cold water. The storing periods of lens care products were primarily in a week for saline and in a month and 2~3 months indicating that storing period of lens care products was relatively well-kept in local optical shops. Conclusions: It is thought that the concern about any microbial infection is not that high since trial contact lenses and lens care products were generally well-managed by opticians in local optical shops from the results above. However, better public eye health and better public confidence in opticians may be possible if further strengthen in avoidance of lens cleaning with saline, keep of cleaning cycles within 2 weeks and rinsing of lens cases with hot water happens.

• Journal of Korean Ophthalmic Optics Society
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• v.18 no.2
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• pp.107-115
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• 2013

Purpose: This study was conducted to investigate the change of soft contact lens parameters after eyeliner deposition and compare the cleaning efficiency and the recovery rate of lens parameters by different cleaning methods. Methods: The eyeliner was deposited on three types of soft contact lenses made of different materials for 1 hour, 4 hours and 6 hours and those lenses were washed by the eyeglasses ultrasonic cleaning and by hands. The changes in visible light transmittance, diameter and surface of those lenses were compared before and after cleaning of the lens. Results: The visible light transmittance of soft contact lenses decreased along with the deposition time of eyeliner. The patterns of the eyeliner deposition on soft contact lens appeared differently depending on the physical properties of the lens material. Thus, the largest eyeliner deposition was found on narafilcon A lens. The diameters of hilafilcon B and etafilcon A lenses were decreased, however, the diameter of narafilcon A lens was increased. The cleaning efficiency of the eyeliner deposition was greater with the multipurpose solution by hands than with the eyeglasses ultrasonic cleaner. However, the recovery of lens parameters such as the lens diameter, visible light transmittance and lens surface due to the eyeliner deposition to its original state was limited. Conclusions: From these results, it is suggested to minimize eye makeup when wearing soft contact lens. Furthermore, the reduced wearing time and shorter cycle of lens replacement may be needed by considering a change of lens parameter when the repeat eye makeup is applied.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.1
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• pp.15-20
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• 2002

The Hydroxyethyl methacrylate(HEMA) was developped in 1960's and later the use of contact lenses increased. At present more and more people use RGP contact lenses. Due to the wide range of optical corrections available and due to their high oxygen transmission Japanese and Korean people like them. Nevertheless one of nine CL users(beginners) stopped wearing the CL within the first year. We conducted a survey to evaluate the level of patient compliance in lens care and maintenance and to assess practitioner knowledge of contact lens information. Generally 6% of contact lens wearers drop out per year. The aim of this research was to find out what opticians can do to reduce the drop-out rate by getting information on handling, on general data of the patient and on optical prescription. Lens wearer were asked to complete a 10 question survey that focused on lens care-wear modality, lens replacement, storage, symptoms and case disinfection. There were total 180 participants in the study. Most of contact lens wearers have an inadequate understanding of contact lens care system. Therefore, it is important that contact lens specialists place more emphasis on practitioner education about general contact lens fields and reinforce patient education during the dispensing visit.

• Journal of Korean Ophthalmic Optics Society
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• v.5 no.1
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• pp.187-192
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• 2000

The objective of this study was to investigate the problems of soft contact lens wear on the women college students. The results were as follows 1. Almost the purchase of soft contact lens was the optical shop. 2. Almost the motive of soft contact lens use was the discomfort of glasses wear. 3. Almost the good feeling of glasses wear was moderate degree. 4. On the main reason of exchange of contact lens, teens was contact lens damage and tweenths was lifespan of contact lens. 5. On the contact lens wearing time at one day, teens was over 10 hours and tweenths was from 7 hours to 10 hours. 6. On the contact care and treatment, teens was a lens washing and storage and tweenths was a lens washing and disinfectant. 7. On the main difficult of contact lens handling, teens was a lens separation in eye and disinfection of lens case and tweenths was a solution treatment and insertion of contact lens in the eye. 8. On the contact lens insertion in the eye, the most difficult item was hanging of the eyelid and fear thinking in teens and fear thinking in tweenths. 9. On the difficult in separate of contact lens wear, a most subjects were eye opening. 10. On the most inconvenient state in contact lens wearing, the subjects were eye redness, foreign body and eye pain. 11. On the advantage of contact lens wearing, teens was decrease in glasses side effects and twenties was a beauty.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.1
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• pp.1-7
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• 2015

Purpose: For optimizing properties of final glasses frame, the aim of this study is to examine the correlation of processing conditions and properties of cellulose acetate (CA) sheets through the investigation of properties of CA sheets prepared under processing steps. Methods: The properties of CA sheets were investigated in terms of different glasses frame processing conditions, bending process, barrel process, and ultrasonic cleaning process. CA sheets prepared through the sequential processing were examined by various analysis: gloss, mechanical properties, thermal properties. Results: After barrel process, hardness and tensile strength of CA sheet were increased. However, bending strength and impact strength were decreased. It is suggested the CA sheet had became rather stiff state (brittle). Also, in degradation temperature region of plasticizer, about 3% of reduction in plasticizer weight was confirmed upon TGA analysis. Conclusions: Glasses frame process, especially in the barrel process have a profound influence on the properties of CA sheet owing to reduction of total amount of plasticizer.

• Korean Journal of Microbiology
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• v.46 no.2
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• pp.152-156
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• 2010

Disposable contact lenses, which are one type of soft contact lenses, provide convenience in use, but also cause various ocular infectious diseases. Microorganisms that cause eye diseases include Acanthamoeba, bacteria, Fungi, and so on. It is impossible to prevent microorganism contamination completely due to the use of hands as wearing contact lenses. The contamination by various microorganisms leads to infectious keratitis, but it is not well known for the exact microorganisms that affect the disease. For this reason, to identify the microorganisms, two groups that are commonly used for disinfection of lenses were divided: normal saline solution and multiple purpose solution. Using these solutions the degree of microorganism contamination was observed according to the days of 1, 3, 5, 10, and 15. Twenty students by two groups from Ophthalmic Optics department at D college in Daegu Metropolitan city participated in the experiment after their ocular health conditions were checked. During they wore one-day disposable lenses for 1, 3, 5, 10, and 15 days, bacteria were cultured in media. The results, which were Gram stained by selecting the cultured colonies, show as followings: Gram positive cocci 33%, Gram-negative cocci 2%, Gram positive bacilli 34%, and the Gram negative bacilli 31%, respectively. As for the identification of potential pathogens, VITEK system and API kit methods were used. Keratitis caused by bacteria known as Staphylococcus aureus, Pseudomonas aeruginosa were detected as a result of wearing contact lenses. This study examined the distribution of bacteria as wearing one-day disposable contact lenses and pathogenic bacteria according to the duration of wearing them. In conclusion, the importance of hygiene when using contact lenses is suggested.

• Journal of Korean Ophthalmic Optics Society
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• v.5 no.2
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• pp.33-42
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• 2000

This study was conducted for 356 customers coming to N optometrist office in Masan city in order to evaluate practice of hygienic control of contact lens storage cases. The results were as follows: 1) For disinfection of contact lens storage case, students used wetting saline solution(42.6%), exclusive wetting solution(23.0%) and 21(11.5%) of them didn't practice disinfection. Others besides students used wetting saline solution(29.1%), boiling water(27.3%) and 42(25.5%) of them didn't practice disinfection(P<0.01). 2) For storage case washing solution, 18(85.7%) out of 21 people who belong to high economic class used wetting saline solution, 3(14.3%) used exclusive wetting solution, 141(48.0%) out of 294 people who belong to middle economic class used wetting saline solution, 129(43.9%) used exclusive solution(P<0.01). 3) For wetting solution of storage case, 132(74.6%) out of 177 students used exclusive wetting solution and the rest(25.4%) used wetting saline solution, 102(64.2%) out of 159 others besides students used exclusive wetting solution, 51(32.1%) used wetting saline solution and 6(3.8%) used sold water and city water(P<0.05). 4) 66(94.3%) out of 70 contact lens storage cases were contaminated by bacteria and Serratia marcescens was isolated in 33(47.1%) out of 70 contact lens storage cases.