• Journal of Korean Ophthalmic Optics Society
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• v.16 no.2
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• pp.117-122
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• 2011

Purpose: This study analyzed the factors related to adaptation of people who wears progressive lenses glasses for the first time. Methods: 463 presbyopia (Aged 41~78) without any ocular diseases with the progressive lens glasses were prescribed from 2010 to 2011 at B clinic in the Gwangju city. Progressive lenses adaptation were analyzed according to gender, age, distance refractive state, presbyopic addition, progressive lens design, the old glasses, astigmatism type, and anisometropia etc. High, mid and low-adapted groups were categorized as the status of wearing progressive lenses glasses, re-wearing, occasionally wearing and failed to weraing, respectively. Results: Men showed significantly higher adaptation (p=0.02) than women. Presbyopic addition (p=0.05) and progressive lens design (p=0.02) were statistically significant. However, it was found that there was so statistical significance for the factors of age, distance refractive state, the old glasses, astigmatism type, and anisometropia. Conclusions: According to the results of this study, when progressive lenses were prescribed, we should consider for adaptation gender, presbyopic addition, and progressive lens design etc.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.4
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• pp.119-125
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• 2007

The aim of the present study was to compare the contrast sensitivity of soft contact lens wearers, spectacle wearers or emmetropia. Seventy myopic eyes and thirty emmetropic eyes aged 19 to 26 years were collected. The myopic group included 48 eyes corrected with spectacle lenses and 22 eyes of them corrected with contact lenses, too: all had corrected vision acuity of 20/20 or better. Spatial contrast sensitivity was measured using the OPTEC 6500 contrast sensitivity view-in tester included the EyeView　 Functional Vision Analysis software at photopic or mesoopic condition. There was no significant difference in contrast sensitivity between spectacle lenses and emmetropes. Myopes corrected with soft contact lenses showed statistical sensitivity losses at 1.5, 12 cycle/degree spatial frequencies. In conclusion, our findings suggest that loss of contrast sensitivity in soft contact lens wearers might be interpreted as evidence for corneal disruption before corneal pathological events occur in contact lens wearers. Contrast sensitivity testing appears to be a useful method for evaluating soft contact lenses.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.1
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• pp.27-35
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• 2012

Purpose: The present study was conducted to compare any difference caused by pigmentation in the centrations and movement patterns on the cornea between circle and soft contact lens with identical material and parameters during lens wearing. Methods: Soft and circle contact lenses with identical material and parameters were applied to twenty eyes with normal tear volume for 3 hrs a day during a total of 5 days and then their lens centrations, the moving distances and rotations by repeat blinking were compared. Results: The lens centration beyond the fitting criteria was shown in initial wears of both soft contact lens and circle contact lens. However, the centration of soft contact lens was changed to the pupil center for being suitable to the fitting criteria with longer wearing time. On the other hand, the decentration of circle contact lens in the horizontal direction was still presented even with longer wearing time. The moving distances of soft contact lens and circle contact lens decreased with the expand of lens wearing but were not significantly different between total wearing period and daily wearing time. The rotation of circle contact lens by repeat blinking was significantly different from that of soft contact lens even when the wearing period was extended. Conclusions: We revealed that the lens centration and movement of circle contact lens on cornea were different from those of regular soft contact lens resulting in bigger difference with the expand of wearing period in the study.

• Journal of Korean Ophthalmic Optics Society
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• v.18 no.4
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• pp.405-411
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• 2013

Purpose: In this study, the mounting status of trial case lens was investigated. Methods: We measured distances between geometric center of lens mount and optical center of lens and angle deviations between axis mark on lens and real axis using arbitrary trial case lens sets distributed in Korea, and then, compared those results with international standards. Results: In some of lenses, the prismatic power on geometric center of lens mount and the angle deviations between axis mark and real axis of cylindrical lens were out of tolerance according international standards. Conclusions: The more precise control of the manufacturing process and more thorough quality control for trial case lenses will be required to offer an accurate vision test.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.89-93
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• 2002

The physiology and morphology of cornea has effected on the ocular refractive status. Therefore the measurement of the anterior corneal surface by keratometer is used the treatment of the spectacles and contact lens by optician, optometrist, and ophthalmologist. Furthermore, currently the most corneal topographic mapping system have used the clinical optical shop, eye research center, and eye hospital. Because this method have a very fine data comparative to the previous instrument. The authors have measurement the cornea of the man college students by the corneal topographic mapping method. Especially this data will applied the clinical practice for the contact lens fitting. Especially in Korea, many man college students use the contact lens for the visual acuity and a beauty. Therefore the contact lens wear have increase per every year.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.4
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• pp.405-410
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• 2005

In this paper, the front radiuses of curvature of spherical spectacle lenses in the cosmetic and optical point of view are investigated and are calculated using Zinken-Sommer condition. The optical power of all spherical spectacle lens shows good quality at the test using autometic lensmeter. However the front radiuses of curvature of spherical spectacle lenses are quite different depending on the lens companies. The front radius of curvature of those lenses is larger than that calculated using Zinken-Sommer condition. We know that the front radius of curvature of commercial spectacle lens is emphasized more cosmetic aspect than optical point of view.

• Journal of Korean Ophthalmic Optics Society
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• v.1 no.1
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• pp.85-91
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• 1996

This is a study of the measurement of inter papillary constance (P.D) in 702 old aged farmers (aged over 45) and the comparision of frame size and distance space of optical center (O.C) from 240 Ready-made Reading spectacles. The average of P.D in male (62.83mm) is greater than in female (61.18mm), and the O.C of Ready-made Reading spectacles of Plastic lens (71.2mm) longer than glass lens (70.8mm). The correction prism power by wearing Reading spectacles in male was 0.7prism to 3.6prism and in female was 0.9prism to 4.4prism. So the prism power in female is greater than in male.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.2
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• pp.111-114
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• 2001

This paper presents the influence of the additive composition on flexural strength and hardness of SiC-TiC composites materials for spectacle lens cutting materials. The materials were hot-pressed at $1800^{\circ}C$ and subsequently annealed at $1910^{\circ}C$ for 3h. The heating rate was $15^{\circ}C/min$ and the cooling rate about $25^{\circ}C/min$ in from the sintering temperature to $1300^{\circ}C$. The growth of particles of spectacle lens cutting materials was analysed by SEM and crystalline phases were discussed by x-ray diffractometry. Typical fracture toughness and hardness of materials for spectacle lens cutting were $6.1MPa{\cdot}m^{1/2}$ and 14.9 GPa, respectively.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.2
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• pp.127-132
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• 2005

Beginning the use of medical order with color contact lens, recently the color contact lens wearer increases for cosmetic order in the world. The marufacture of color contact lenses was the pigment application method, the pigment inlay method, the sandwich method, the vinding method, and so on. Now in domestic, the main use of manufacture has been the binding method. In the point of the use and manufacture of the color contact lenses, the classification of color contact lenses was the tinted and the cosmetic types. However the generally coloring of color contact lenses was the stain-method and the staining was marufactured by the thin film methods.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.107-110
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• 2001

In order to estimate the UV-A line's cut efficiency it lens, it was measured the light transmittance in the 320~400nm wavelength regions. We obtained the area to integrate the light transmittance of standard CR-39 and sample in the 320~400nm wavelength regions and established ${\alpha}$, ${\beta}$ of UV-A line's cut efficiency by contrast its area. We obtained the absolute cut efficiency ${\alpha}$ CR=0.59 value of CR-39 Lens, and if ${\alpha}$ was the absolute cut efficiency value of the lens to estimate UV-A cut effect, the relative cut efficiency ${\beta}$ was $1.69{\alpha}$. It was obtained the absolute and the relative UV exclusion index through each $a=(1-{\alpha}){\times}100%$, $b=(1-{\beta}){\times}100%$.