Volume of the Three-Dimensional Visual Field and its Objective Evaluation by Shape Coefficient: Normal Values by Age and Abnormal Visual Field
| Autor: | Fumio Furuno, Hirotaka Suzumura, Harutake Matsuo |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
medicine.medical_specialty
genetic structures business.industry Normal values eye diseases Visual field Low Tension Glaucoma Ophthalmology Field size medicine Computer vision Artificial intelligence Objective evaluation Sensitivity (control systems) Visual angle business Mathematics Volume (compression) |
| Zdroj: | Documenta Ophthalmologica Proceedings Series ISBN: 9789401089326 |
| DOI: | 10.1007/978-94-009-5512-7_78 |
| Popis: | The distribution of visual field sensitivity was measured as a function of visual angle and expressed in polar coordinates. This procedure provides an accurate impression of the visual field and emphasises visual field sensitivity; additional coefficients are not necessary. As normal controls, 229 eyes of 145 cases were examined. The results of kinetic quantitative perimetry were calculated and three-dimensional visual field representations were plotted by a computer. The normal visual field is larger in the young (subjects from 10 to about 40 years of age). After the fourth decade the field size gradually reduces. The three-dimensional ‘sensitivity loss’ occurs first at the center, then at the peripheral regions. Further, glaucomas were classified into high tension glaucoma (HTG) and low tension glaucoma (LTG). LTG has a slightly different manifestation of visual field disturbance than HTG. |
| Databáze: | OpenAIRE |
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