Reproducibility of Data Obtained by a Newly Developed Anterior Eye Segment Analysis System, EAS-1000

Sakamoto, Y.; Sasaki, Kohsuke; Nakamura, Y; Watanabe, Noriko

doi:10.1159/000267202

Cited by 40 publications

(28 citation statements)

References 6 publications

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“…Before selectioning the subjects of this study, all of the subjects from cataract epidemiology surveys were objectively diagnosed through documented images and their gradings were classified according to the sys tem established by the Japanese Cooperative Cataract Epidemiology Study Group [6], To judge and evaluate changes in the lens transpar ency, the light scattering intensity, as an indicator of lens transparency, was densitometrically evaluated from the slit images applying the equipped image anal ysis program developed by the authors' group [7,8], Light scattering intensity was measured on thirteen layers ( fig. 1).…”

Section: Diagnosis and Classification O F Cataract And Judgement O F mentioning

confidence: 99%

Changes in Light Scattering Intensity of the Transparent Lenses of Subjects Selected from Population-Based Surveys Depending on Age: Analysis through Scheimpflug Images

Fujisawa¹,

Sasaki²

1995

Ophthalmic Res

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The physiological ageing changes of decreasing lens transparency were objectively evaluated in a total of 1,040 eyes selected from 1,685 individuals who were the subjects of population-based cataract epidemiological surveys performed in three climatically different survey fields in Japan. The lens transparency changes were evaluated from the light scattering intensity on thirteen different lens layers seen in slit images taken by the latest type of Scheimpflug camera. The mean percentage prevalence of cataracts in all the epidemiological survey subjects including grading from I to III, which was also judged objectively through documented images, was 64.6% in the Noto subjects, 46.6% in the Hokkaido subjects and 38.0% in the Okinawa subjects. The lens transparency at all of the measuring points decreased with ageing. The above changes, seen in the lenses of subjects in their 40s to 60s, were obviously more prominent compared with those seen in subjects in their 40s. Although there were some differences in transparency decrease with ageing among the subjects of the three areas, the authors tentatively propose to show the data obtained from the Noto subjects as representative of Japanese individuals. Lens transparency changes on each lens layer showed characteristic ageing changes and those of the representative four layers showed an exponential decrease in transparency. The decreasing ratio might accelerate from age as early as the mid-40s.

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Section: Diagnosis and Classification O F Cataract And Judgement O F mentioning

confidence: 99%

Changes in Light Scattering Intensity of the Transparent Lenses of Subjects Selected from Population-Based Surveys Depending on Age: Analysis through Scheimpflug Images

Fujisawa¹,

Sasaki²

1995

Ophthalmic Res

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“…0.08 mm, which is projected perpendicularly onto the cornea. The charge-coupled device camera is placed 45 degrees to the plane of the slit light and focuses on the entire depth of the cornea by using the Scheimpflug principle [21,22]. The flash light power can be set to 50, 100, or 200 Ws by changing the electrical current, which enables the maintenance of the light quality at the object plane (cornea).…”

Section: Methodsmentioning

confidence: 99%

Quantification of Simulated Corneal Haze by Measuring Back-Scattered Light

Soya¹,

Amano

Oshika

2002

Ophthalmic Res

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The Scheimpflug anterior eye segment analysis system EAS-1000 was modified to specifically quantitate the degree of corneal haze. In order to confirm the basic measurement performance of the new system, TSPC-3 hazemeter, in vitro experiments were conducted. Using white latex microsphere solutions, tests were performed for the linearity of the measurements, the influence of slit lamp illuminance and the influence of the length of the light path through the latex solution. The validity of Beer’s law was confirmed, indicating that a sufficiently wide range of latex concentrations (haze intensities) can be covered by the hazemeter. The scattering intensity measured with the hazemeter showed a significant linear correlation with the latex concentration. The obtained scattering intensity was directly proportional to the illuminance of the slit lamp. The ratio of integrated scattering values was proportional to that of the light path length. It was shown that the TSPC-3 hazemeter possesses sufficient capability for a quantitative evaluation of corneal haze.

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“…We used the Scheimpflug system EAS-1000 of Nidek Co. with digital image analysis. The same system allows to take additional retroillumination photographs and their analysis [8][9][10]. We could prove in a former exploration the good quality and reliability of biometric data in pseudophacic eyes obtained by this system [11,12].…”

Section: Methodsmentioning

confidence: 99%

Image Analysis of Implanted Rigid and Foldable Intraocular Lenses in Human Eyes Using Scheimpflug Photography

et al. 1999

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We evaluated the quality of imaging posterior chamber intraocular lenses (PC IOL) by Scheimpflug photography. We took photographs of 190 rigid or foldable PC IOLs using the Scheimpflug system EAS-1000 from Nidek and provided digital image analysis. We found a good imaging of PC IOLs and the cristalline lens capsule, data obtained by digital image analysis were reliable and reproducible and Scheimpflug photography could be demonstrated as a sensitive tool to show any irregularities of IOL material. Thus, we found in foldable IOLs ‘glistenings’, which did not have any influence on functional results and we could distinguish them from lens damage. We propose to use Scheimpflug tests regularly for the examination of implanted new types of IOLs.

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Reproducibility of Data Obtained by a Newly Developed Anterior Eye Segment Analysis System, EAS-1000

Cited by 40 publications

References 6 publications

Changes in Light Scattering Intensity of the Transparent Lenses of Subjects Selected from Population-Based Surveys Depending on Age: Analysis through Scheimpflug Images

Changes in Light Scattering Intensity of the Transparent Lenses of Subjects Selected from Population-Based Surveys Depending on Age: Analysis through Scheimpflug Images

Quantification of Simulated Corneal Haze by Measuring Back-Scattered Light

Image Analysis of Implanted Rigid and Foldable Intraocular Lenses in Human Eyes Using Scheimpflug Photography

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