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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Ophthalmic Optics Society
Journal Basic Information
Journal DOI :
The Korean Ophthalmic Optics Society
Editor in Chief :
Volume & Issues
Volume 16, Issue 4 - Dec 2011
Volume 16, Issue 3 - Sep 2011
Volume 16, Issue 2 - Jun 2011
Volume 16, Issue 1 - Mar 2011
Selecting the target year
Measurement of Horizontal and Vertical Prism Diopter According to Difference between the Optical Center and Pupil Center
Kim, Hyojin ; Park, Jee-Hyun ; Park, Seon-A ; Baek, Ji-Seon ; Lee, Eun-Hee ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 1~5
Purpose: Measurement of the horizontal and vertical prism diopter was investigated which was occurred due to distance differences between the optical inter-centeral distance (OC) and the interpupillary distance (PD) of the prescribed glasses. Methods: We surveyed 96 subjects (192 eyes) at the average age of 21.56 years old. The PD was measured by using the PD measurement system (DONGYANG PD-85, Korea), and the OC of the glasses was measured by using the projective peak refractive power measurement system (TOPCON CL-200, Japan). The OH value was measured by using Penlight and the PD ruler. Results: The PD which had been measured by the PD system and the OC of the glasses revealed 78.1% of differences. 62.5% of the objects were base-in value prescribed glasses; 58.3% were out of permissible error. Only 8 subject showed concurrence between the prescribed glasses and the OH value, and 82.3% of the objects were induced vertical prism of over 1 (prism diopter). Conclusions: In order to improve the vision function of people who wear glasses, it is necessary to advance the accuracy of PD, OH measurement and making glasses as well.
Differences of Dynamic Visual Acuity According to Optical Lens Color
Lee, Min-A ; Kim, Young Ji ; Jeong, Ju-Hyun ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 7~11
Purpose: The purpose of this study is to investigate the differences of dynamic visual acuity to color of optical lens. Methods: we measured dynamic visual acuity using 5 colored lenses (transparent, yellow, blue, green, brown) for 30 university students. Results: Dynamic visual acuity were highest on yellow colored lens and lowest on brown colored lens, for both of naked eyes and contact lens wearers. Conclusions: It can be concluded that optical lens color can influence on dynamic visual acuity. Selection of colour lense can enhance or decrease of dynamic visual acuity. Therefore, a selection of colour lense should be carefully decided especially for athletes who needs a good dynamic visual acuity.
Studies on the Cellulose Acetate Glasses Frame Sheet
Lee, Hae Sung ; Lee, Sung Jun ; Jung, Sang Won ; Kim, Hyun-Chul ; Kim, Eunjoo ; Go, Young Jun ; Lee, Se Guen ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 13~19
Purpose: The purpose of this study was to assess characterize overseas company's Cellulose acetate glasses frame sheets (overseas company's CA sheet) Also, the optimum content of plasticizer and melt extrusion condition of industrial CA resin were established for appropriate glasses frame. Methods: Overseas company's Cellulose acetate glasses frame sheets (overseas company's CA sheet) were characterized by
-NMR, GPC, and TGA. Also, the optimum content of plasticizer and melt extrusion condition of industrial CA resin were established. Results: The plasticizer of overseas company's CA sheet measured by
-NMR was diethyl phthalate, and its content was measured 30 wt% by TGA. Also, industrial CA resin showed enough melting behavior in the range of 190~200
. Compared to overseas company's CA sheet's tensile strength value of 2.2~2.8 kgf/
, industrial CA resin exhibited sufficient tensile strength value of 2.3 kgf/
for glasses frame. Conclusions: Industrial CA resin with 30 wt% plasticizer content would be a promising material for glasses frame prepared by melt extrusion to replace China CA sheet.
The Comparison of Lens Movement by the Fitting States of Soft Contact Lenses in Normal and Dry Eyes
Jung, Da I ; Lim, Shin Kyu ; Kim, So Ra ; Park, Mijung ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 21~30
Purpose: The study was performed to compare the differences in lens rotation, lens movement by blinking and lens centration with alignment or steep fitting of soft contact lens in normal and dry eyes. Methods: Total 40 eyes (aged 20~30 years) were classified into the normal (n=20) or dry eye group (n=20) by the diagnosis methods for dry eyes and worn soft contact lens (polymacon material) with alignment fitting or steep fitting. Lens rotation, lens movement by blinking and lens centration were separately measured immediately after lens wearing and after stabilization of tear film and compared by fitting states of soft contact lenses. Results: With steep fitting of soft contact lens in dry eyes, averaged lens rotation immediately after lens wearing was not significantly different from that of the normal eye group with alignment fitting however, lens rotation after stabilization in dry eyes was significantly larger than that in normal eyes. Any significant difference in lens movement by blinking was not shown in normal eyes. However, lens movement by blinking in dry eyes was increased with steep fitting. The range of lens centration on cornea in normal eyes with alignment fitting was more vertically distributed. On the other hand, the range of lens centration on cornea in dry eyes with alignment fitting was more horizontally distributed. Lens centration was shown to be changed by stabilization of tear film. That is, lens centrations were somewhat vertically widespread immediately after lens wearing and restrictively distributed in horizontal direction, respectively, with steep fitting in dry eyes. Conclusions: These results suggested that lens movements and centration in dry eyes were different from those of normal eyes. Especially, those differences between normal and dry eyes were much bigger with steep fitting of soft contact lenses. Thus, those differences should be considered for the comfortable and safe fitting of soft contact lens in dry eyes.
The Investigation on Ultrasonic Cleaning of Soft Contact Lenses in Local Optical Shops and the Protein Removal Effect by Lens Containers
Koo, Sung Bong ; Cho, Seul Bee ; Park, Mijung ; Kim, So Ra ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 31~40
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.
A Comparison of Lens Centrations on Cornea with RGP Lens Fitting by the Measured Values using Keratometer and Corneal Topography
Kim, So Ra ; Park, Sang-Il ; Lee, Se Eun ; Park, Mijung ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 41~50
Purpose: The present study was conducted to compare the centration of RGP lens on cornea when lens was fitted based on keratometric astigmatisms measured by keratometer and the lens centration when fitted by corneal topography. Methods: Thirty eight eyes of 19 male and female in their twenties were applied RGP lens with 9.9 mm of diameter by the keratometric astigmatisms classified by the measurement with a keratometer. Then, lens centrations were estimated using high speed camera and compared with the lens centration when fitted by total keratometric astigmatism using corneal topography. The relationship of the steepest location of cornea and lens centration was further compared. Results: With the rule astigmatism, lens centration was not changed even with the difference in central and total keratometric astigmatisms. When the relationship of the steepest part of cornea measured by corneal topography and lens centration was analyzed, the lens centration in vertical direction was exactly correlated with the steepest part of cornea in 52.3% of subjects. In the case of non-correlation, the steepest part of cornea was mostly upper part of cornea, however, lens centration was located on lower part of cornea. The lens centration in horizontal direction was exactly correlated with the steepest region of cornea in 65.6% of subjects. In non-correlated case, the difference in cornea curvatures between the steepest and the flattest parts was smaller than 0.05 mm in 76.9% of subjects. Conclusions: From these results, we conclude that corneal topographic patterns may more contribute the centration of RGP lens on cornea than the difference in central and total keratometric astigmatisms.
Near Visual Performance of Multifocal Contact Lenses in University Students
Jong, Woo-Cheol ; Kim, Soo-Hyun ; Kim, Jai-Min ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 51~60
Purpose: This study was to investigate visual performance and subjective satisfaction with multifocal soft contact lenses at near works in university students. Methods: In a cross-over study design, 26 students (6 male, 20 female) who did not have any ocular disorder with at least 20/20(1.0) binocular vision were fitted with singlevision lenses (SofLens
, Bausch + Lomb Co. USA) or multifocal lenses (SofLens Multifocal, Bausch + Lomb Co. USA). After 2 weeks, visual performance assessments included visual acuity, stereoacuity and contrast sensitivity function at distance and near. Near point of accommodation, accommodative facility, near point of convergence, vergence facility and near range of clear vision at near were examined. Students' satisfaction and preference were measured using survey questionaries. Results: Subjects maintained at least 20/20 binocular vision with multifocal and single-vision lenses at distance and near. There was no difference between multifocal and single-vision lenses in stereoacuity, contrast sensitivity function and vergence facility at far and near. The near point of accommodation, accommodative facility, near point of convergence and the near range of clear vision with multifocal lenses were better than single-vision lenses. On the survey questionaries, subjects reported that they preferred and satisfied with multifocal lenses with near works, and single-vision lenses with distance works. Conclusions: The majority of university students preferred multifocal to single vision lenses because multifocal lenses provided better visual performance at near works. This study suggests that multifocal lens is helpful for young adult in prolonged near works.
Design of the Finite Schematic Eye with GRIN Crystalline Lens Considering Iris Eccentricity
Kim, Bong-Hwan ; Han, Sun-Hee ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 61~64
Purpose: The purpose of this study was to design the finite model eye with GRIN lens similar to actual eye, which considered the effect of iris eccentricity on eyes. Methods: By using the finite model eye with Radial GRIN and Spherical GRIN, which were designed previously, the location of iris was eccentrically located by 0.5 mm in the direction of nose to show the same eye as actual one. For ray trace and design, Code V program of Optical Research Associates (ORA) was adopted. Results: Designed model eye was compared to actual eye depending on iris eccentricity and the model eye which showed reduced value was corrected according to actual eye to design the finite model eye. Conclusions: Ocular optical systems considered the point that iris was a rotational asymmetry and designed the finite model eye with GRIN lens, which was similar to actual eye, by considering the effect of iris eccentricity on eye.
The Study on Improvement of Reading Ability for Dyslexia Wearing Color filter lens (ChromaGen
Lee, Seok-Ju ; Park, Ji-Hoon ; Lee, So-Hee ; Whang, Kwang-Ha ; Ryu, Guen-Chang ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 65~74
Purpose: In this study we investigated improvement degree of reading ability of the student who was in a condition of dyslexia symptoms by wearing
lenses. Methods: After wearing the
lens for 3 months, the dyslexia symptoms corrective lens, 52 students who had suspected symptom of dyslexia were asked questions, and we measured the improvement degree of reading ability of the student. Results: The
wearer read 110.26
22.07 words in 1 minute, and naked yeses or glass wearing students read 106.42
22.70 words. Reading ability of the student having suspected symptom of dyslexia were measured after wearing
for 3 months. The results showed improvement reading ability of 3.70
0.29 (p=0.01, t=2.26), 4.50%
0.10 (p=0.01, t=2.78) for
wearer with statistical difference. A survey on the satisfaction of reading improvement with wearing
showed that 88.4% of questioned person answered wearing
had improved their dyslexia symptoms. Conclusions: With statisical significance (p<0.05). this study suggests that
lens has an effect on improving reading speed of dyslexia patient. We know from these results that the
lens which is used to dyslexia had an effect to improvement of reading speed for dyslexia. And the results of this study is statistically different (p<0.05).
The Diurnal Change of Accommodative Functions by Near Work
Lee, Jeong-Yun ; Yu, Dong-Sik ; Son, Jeong-Sik ; Cho, Hyun Gug ; Moon, Byeong-Yeon ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 75~81
Purpose: The daily changes of accommodation at period 1 (08:00~10:00), period 2 (13:00~15:00) and period 3 (18:00~20:00) were surveyed with fifty two incipient presbyopia of from 38 to 49 years old. Methods: 52 incipient presbyopia subjects (30 men, 22 women) were classified into 4 groups (groupI:
7 hrs~group IV: < 3 hrs) according to near working amount. Their amplitude of accommodation, accommodative facility and relative amplitude of accommodation were inspected, respectively. Results: The amplitude of accommodation was measured to be the lowest for the groupI that near working time was the most during daily work, and the amplitude of accommodation of oculus dexter, oculus sinister and oculus uterque were the highest at period 2 in case of all the group I~IV. In the accommodative facility, it appeared that the oculus dexter, oculus sinister and oculus uterque of group I, oculus dexter and oculus sinister of group II, and oculus dexter, oculus sinister and oculus uterque of group III were the highest at period 2. The oculus uterque of group II and oculus dexter, oculus sinister and oculus uterque of group IV were the highest accommodative facility at period 3. It appeared that the negative relative accommodation was the highest at period 1 in case of all the group I~IV, and the positive relative accommodation was the highest at period 2 in case of the group I~III and was the highest at period 3 in case of the group IV. Conclusions: Because the difference of near working time affects the accommodation, it would become a help in solving the asthenopia symptom of the incipient presbyopia that opticians consider their near working time during daily work and take a checkup on their accommodation.
Self-Reported Symptoms and Stereopsis in Viewing 2D and 3D Images
Lee, Wook-Jin ; Son, Jeong-Sik ; Kwak, Ho-Won ; Kim, In-Su ; Yu, Dong-Sik ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 83~90
Purpose: This study aimed to compare and assess whether there was a relation between self-reported symptom and stereopsis in viewing an anaglyph 3D and a general 2D image. Methods: Seventy subjects (38 males, 32 females) were students ranging in age from 20 to 30 years. Subjects' symptoms were investigated by a questionnaire after viewing the 2D image and the anaglyph 3D image using red-green glasses for 30 minutes. Titmus circles and TNO stereopsis tests were performed before and after the images. A correlation between symptom and stereopsis was evaluated. Results: Both ocular and nonocular symptom in viewing 3D image were higher than those in 2D image. Titmus circles stereopsises using polarized filters were not changed before and after viewing images, but TNO stereopsises using color filters such as red-green glasses were increased after viewing 3D image. Ocular symptom and TNO stereopsis were increased after viewing 3D image, and there was a good correlation between them (r=0.605). Conclusions: Better stereopsises before viewing 3D are relatively lower ocular symptoms in viewing 3D image. But symptoms are increased in viewing anaglyph 3D image for a short-time and improvement of TNO steropsis is poorly associated with the relief of ocular symptoms. This tendency seems to be related with an adaptation to anaglyph 3D image with red-green glasses.
Selective Accumulation of Rhodamine B in Müller cells in Rabbit Retina
Kwon, Oh Ju ; Lee, Eun Shil ; Jeon, Chang Jin ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 91~95
Purpose: In this study, we investigated the dye to staining for selective accumulation in rabbit retina. Methods: Rhodamine B was injected into the vitreous body in rabbit. After 24 h, the isolated retina was checked condition of cell staining on the microscope. We used conventional immunocytochemical techniques for recognizing cell type. Results: Well-labeled nuclei were seen in the middle of the inner nuclear layer of the rabbit retina. The number and distrbution of the accumulating cells were similar to those of the m
ller glia. To identify m
ller cell, we used antibody directed against vimentin. Rhodamine B-immunoreactive nuclei also were labeled with antivimentin antibody. We found that Rhodamine B was accumulated selectively in retinal m
ller cell. Conclusions: Specific accumulation in rabbit retinal m
ller cell occurred when Rhodamine B was applied to living retina.
Analysis on the Depressing Force to the Cornea by Fitted Spherical Contact Lens
Kim, Dae Soo ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 97~106
Purpose: This review article was written to theoretically compare the depressing force (pressure, adhesion) to the cornea between when the spherical lenses were being tightly and flat fitted. Methods: Mathematical equations and their numerical solution programs (model) were formulated to calculate the depressing (adhesion) force to the cornea by both the tightly and flat fitted contact lenses. Based on this proposed model the effects of parameters characterizing a contact lens such as BCs, diameters, edge shape and corneal shape (ratio of long and short corneal axis, p) on the depressing force to the cornea were predicted/analyzed in both tightly and flat fitting regimes. Results: Corneal adhesion increased as the corneal p-value increased. Adhesion increase caused by the increased p-value was much larger in flat fitted case than in tight fitted one. Corneal adhesion reduced abruptly as the BC increased in flat fitting regimes while the adhesion rise was insignificant in tight fitting ones. Reduction in corneal adhesion due to lens-size increase was predicted to be insignificant in both tight and flat fitting regimes. Both the lens edge shape (edge angle) and thickness were relevant only in tight fitting regime. Corneal adhesion increased as the increased with tight-fitted lenses. As the thickness of tight fitted lenses increased, corneal adhesion inversely decreased. Conclusions: The two most significantly affecting the depressing force to cornea were found to be the degree of corneal bending toward the periphery and the BCs of lenses.
An Excel Program for Dk Calculation of Contact Lens
Kim, Dae Soo ;
Journal of Korean Ophthalmic Optics Society, volume 16, issue 1, 2011, Pages 107~116
Purpose: The review article was written to establish an excel program that could calculate minimal Dk of contact lens without
deficiency and actual
concentration on cornea when contact lens were being fitted by changing lens-related factors. Methods: An excel program was formulated to calculate the thickness of post-lens lacrimal layer, Dk of contact lens and
concentration on cornea. Results: With the excel program established, minimal
concentration needed on cornea could be calculated when the thickness of post-lens lacrimal layer was changed by varying lens-related factors. A different route in the excel program was needed to choose based on the shape of lacrimal layer. The thickness of lacrimal layer was determined by the shape of meniscus made of tear between lens edge and cornea with flat fit. Thus, the
concentration showing negative number in calculation decreased on peripheral cornea with flatter fitting and actual
concentration would be zero on cornea. With tight fitting, the thickness of post-lens lacrimal layer is much thicker than lens itself thus negative number in calculation by the excel program is shown indicating zero oxygen on cornea. It can cause
deficiency regardless of Dk of contact lens. Conclusions: The calculation of thickness of post-lens lacrimal layer and
concentration on cornea by the established excel program is suggested to avoid
deficiency when fitting state is varied by changing lens-related factors.