PURPOSE: To evaluate the vault change after implantable collamer lens (ICL) size exchange according to the preoperative vault. METHODS: In 14 eyes of 13 patients, the vault change after ICL exchange operation due to unideal vault was compared in 2 groups, the smaller ICL exchanged group and larger ICL exchanged group. RESULTS: In 6 out of 14 eyes, the ICL was exchanged to a 0.5 mm smaller size and the vault was changed from 1.38 mm (1.18-1.70) to 0.71 mm (0.51-0.92) (p = 0.03). In 8 eyes, the ICL was exchanged to a 0.5 mm bigger size and the vault was changed from 0.07 mm (0.03-0.13) to 0.50 mm (0.12-1.01) (p < 0.01). The exchange operation was performed at 3.5 postoperative days (1-6) if the ICL was exchanged to 1 step smaller size, but the exchange operation was performed at 135 postoperative days (90-660) if the ICL was exchanged to 1 step bigger size (p < 0.01). CONCLUSIONS: ICL exchange to 1 step smaller or bigger size is an effective method to correct unideal postoperative vault to a more ideal vault size. The exchange to 1 step smaller size ICL tended to be performed sooner.
Humans ; Phakic Intraocular Lenses*

No abstract available.
Dislocations* ; Phakic Intraocular Lenses*

Noncontact tonometer is a convenient instrument for checking of intraocular pressure without corneal touch. We compared the IOP of 45 eyes in 24 patients with and without soft contact lenses. Two measurements were taken on each eye while the patients were wearing soft conbtact lenses by noncontact tonometry, and rechecked immediatly after the lenses were removed. There was no significant differance between two measurements(t-test, P>0.05).
Contact Lenses, Hydrophilic* ; Humans ; Intraocular Pressure* ; Manometry*

UV-absorption method was able to determine protease activities in various kinds of enzymatic cleaners. Bioclen G and O2 had high protease activeities at room temperature and were effective for artificial protein deposits; Bioclen G is safe for the eyes because enzyme was inactivated at 70 degrees C. Both products were better enzymatic cleaners for both hard and soft contact lenses. Hydrocare-F was effective for removing artificial protein deposits. For the sake of safety against the eyes, there was a problem in that this product had too high protease activity at 90 degrees C. Protease activities were generally lower or showed great variations at 10~30 degrees C for other products. These had lower cleaning effect for artificial protein deposits on rigid gas permeable contact lenses.
Contact Lenses* ; Contact Lenses, Hydrophilic

UV-absorption method was able to determine protease activities in various kinds of enzymatic cleaners. Bioclen G and O2 had high protease activities at room temperature and were effective for artificial protein deposits; Bioclen G is safe for the eyes because enzyme was inactivated at 70 degrees C. Both products were better enzymatic cleaners for both hard and soft contact lenses. Hydrocare-F was effctive for removing artificial protein deposits. For the sake of safety against the eyes, there was a problem in that this product had too high proteasea activity at 90 degrees C. Protease activities were generally lower or showed great variations at 10 ~ 30 degrees C for other products. These had lower cleaning effect for artificial protein deposits on rigid gas permeable contact lenses.
Contact Lenses* ; Contact Lenses, Hydrophilic

Myopia is a major public health problem and its prevalence is increasing over time in Korea. The main treatment options of myopia correction are spectacle lenses, contact lenses, refractive surgeries such as photorefractive keratec-tomy (PRK), laser in situ keratomileusis (LASIK), and laser epithelial keratomileusis (LASEK), phakic intraocular lenses and clear lens extraction. Each treatment option has its own indications and contraindications, and not only has some advantages over the others but also some disadvantages. The evidence shows that most therapies for myopia have stable and safe results, although some do not. Customized therapy, real time tracking and sensing, and femtosecond laser-assisted surgeries might be ubiquitous in the near future. This review will discuss current treatment options for myopia and will introduce possible future therapies.
Contact Lenses ; Keratomileusis, Laser In Situ ; Korea ; Myopia ; Phakic Intraocular Lenses ; Prevalence ; Public Health ; Refractive Surgical Procedures ; Track and Field

Soft Contact Lenses(SCL) are used widely instead of glasses among young female, especially university students, for cosmetic purpose. Usually Shirmer test has been used to evaluate the tear production state however more objective method is the tear film break up time. Authors evaluated the effect of soft contact lenses on BUT. We selected 40 femalse wearing on Hyper-Thin soft contact lenses, and One Soflens(Baush and Lomb) as soft contact lens wearing group and 30 females without no evidence of systemic disease or ocular disease affecting on tear production as normal control group. And authors studied mean value of BUT at each group, difference of BUT between 2 groups and finally evaluated the BUT change accord ing to duration of wearing. The results were as follows. 1. The mean value of tear film break up time(BUT) was 8.64 +/- 3.91 seconds and 11.12 +/- 4.94 seconds in soft contact lens wearing group and normal control group respectively. 2. There was a statistically significant difference of BUT between each group(P<0.05). 3. There was statistically significant difference of BUT between more than 4 years of soft contact lens wearing group and less than 3 years of wearing gorup(P<0.05).
Contact Lenses, Hydrophilic* ; Eyeglasses ; Female ; Glass ; Humans ; Tears*

The times of uptake and release of pilocarpine solution by soft contact lenses were studied with spectrophometer in vitro. The uptake time was about 30 minutes and the releasing time was stationary after 30 minutes. The lower concentriction of pilocarpine solution was generally rapid uptake and release than higher.
Contact Lenses, Hydrophilic* ; Pilocarpine*

PURPOSE: To investigate the accuracy of intraocular pressure (IOP) measurement through a plano soft contact lens (SCL) in situ by a noncontact tonometer (NCT) and a rebound tonometer (RBT). METHODS: The IOP of 66 eyes of 33 subjects with no ocular pathology was measured by NCT (tonometer CT-80, TOPCON, Japan) and RBT (iCare rebound tonometry(TM), Tiolat Oy, Finland). IOP measurement was repeated through plano SCL (ACUVUE OASYS(R), Johnson & Johnson Vision Care Inc., USA) in situ. Statistical analysis was performed using the paired t-test. RESULTS: Mean IOP measured by NCT was 13.10 +/- 2.52 mmHg without SCL and 12.95 +/- 2.56 mmHg with SCL. Mean IOP measured by RBT was 14.13 +/- 2.94 mmHg without SCL and 13.84 +/- 2.75 mmHg with SCL. No significant statistical differences were found between IOP measured with and without SCL (p=0.47, p=0.11 respectively). CONCLUSIONS: Reliable measurement of IOP by NCT and RBT can be achieved through plano SCL.
Contact Lenses, Hydrophilic ; Eye ; Intraocular Pressure ; Vision, Ocular

PURPOSE: To evaluate the crystalline lens thickness/anterior chamber depth (CLT/ACD) ratio as a preoperative factor that affects the vault after implantable contact lens (ICL) implantation. METHODS: A total of 130 eyes of 130 patients who received bilateral ICL implantation were included in the present study. The preoperative CLT/ACD ratio was analyzed to determine if the patients had any correlation with postoperative vault by Visante optical coherence tomography (OCT). RESULTS: The mean vault was 0.58 mm +/- 0.23 at postoperative 2 months. Eight eyes (6.15%) had low vault, 93 eyes (71.53%) had ideal vault and 29 eyes (29.31%) had high vault. The CLT/ACD ratios were 1.04 mm +/- 0.11, 0.96 mm +/- 0.09 and 0.90 mm +/- 0.09 in the low vault group, ideal vault group and high vault group, respectively (p < 0.01). The CLT/ACD ratio showed statistically significant correlations with postoperative vault in univariate analysis (r = -0.4718; p < 0.01) and in multivariate analysis (p < 0.01). CONCLUSIONS: Vaults after ICL implantation have a negative correlation with the preoperative CLT/ACD ratio. The results from the present study may improve the prediction of postoperative vault after ICL implantation.
Anterior Chamber ; Eye ; Humans ; Lens, Crystalline ; Lenses, Intraocular ; Multivariate Analysis ; Phakic Intraocular Lenses ; Tomography, Optical Coherence