of less than 1 minute of arc, then their visual acuity will be 1. If the person being tested has a visual acuity of only 0.5, then the test symbol displayed must be doubled in size in order for it to be [...] focused on the retina. Reduced visual acuity Visual acuity is influenced by a wide variety of factors, which are determined not only by the eye itself but also environmental influences. The interaction of [...] of magnifying vision aids. Determining visual acuity In order to determine the corrected visual acuity, a variety of test symbols are used by ophthalmologists and opticians. In addition to Landolt rings
86 x 54 x 6 mm.Replacement battery: Order No. 15471, requires 2 batteries.Display and Optoform equipement available.Product AccessoriesReplacement battery: Order No. 15471, requires 2 batteries.  [...] out of its case.The LED light does not require changing. The tiny, extremely bright LED light used by Eschenbach Optik has a service life which is virtually unlimited.Product PropertiesDiffractive aspheric [...] ite Operating unit (magnifying glasses) Magnification6 xDioptre24 dptMaterialsmanual_easyPOCKET.pdf1.4 MBProduct overview
86 x 54 x 6 mm.Replacement battery: Order No. 15471, requires 2 batteries.Display and Optoform equipement available.Product AccessoriesReplacement battery: Order No. 15471, requires 2 batteries.  [...] out of its case.The LED light does not require changing. The tiny, extremely bright LED light used by Eschenbach Optik has a service life which is virtually unlimited.Product PropertiesDiffractive aspheric [...] Coloursilver Operating unit (magnifying glasses) Magnification3x*Dioptre8 dptMaterialsmanual_easyPOCKET.pdf1.4 MBProduct overview
86 x 54 x 6 mm.Replacement battery: Order No. 15471, requires 2 batteries.Display and Optoform equipement available.Product AccessoriesReplacement battery: Order No. 15471, requires 2 batteries.  [...] out of its case.The LED light does not require changing. The tiny, extremely bright LED light used by Eschenbach Optik has a service life which is virtually unlimited.Product PropertiesDiffractive aspheric [...] Colourblue Operating unit (magnifying glasses) Magnification4 xDioptre16 dptMaterialsmanual_easyPOCKET.pdf1.4 MBProduct overview
86 x 54 x 6 mm.Replacement battery: Order No. 15471, requires 2 batteries.Display and Optoform equipement available.Product AccessoriesReplacement battery: Order No. 15471, requires 2 batteries.  [...] out of its case.The LED light does not require changing. The tiny, extremely bright LED light used by Eschenbach Optik has a service life which is virtually unlimited.Product PropertiesDiffractive aspheric [...] Colourblack Operating unit (magnifying glasses) Magnification3x*Dioptre8 dptMaterialsmanual_easyPOCKET.pdf1.4 MBProduct overview
AccessoriesTable Base Order-No. 27729Cast iron, 260 mm Ø, weight 6 kg.Suitable for stand magnifier 27771.Technical data Lens properties Lens SizeØ 132 mm Optical Properties Magnification1.9 xDioptre3.55 dp [...] due to low power requirement of the LED which is only 15 W.Product PropertiesRing lighting provided by 36 long-life high performance LEDs with primary lens system for optimal concentration of light and
AccessoriesTable Base Order-No. 27729Cast iron, 260 mm Ø, weight 6 kg.Suitable for stand magnifier 27771.Technical data Lens properties Lens SizeØ 132 mm Optical Properties Magnification1.9 xDioptre3.55 dp [...] due to low power requirement of the LED which is only 15 W.Product PropertiesRing lighting provided by 36 long-life high performance LEDs with primary lens system for optimal concentration of light and
due to low power requirement of the LED which is only 15 W.Product PropertiesRing lighting provided by 36 long-life high performance LEDs with primary lens system for optimal concentration of light and [...] 3 m.Supplied with table clamp for table top thicknesses of 18-74 mm.Product AccessoriesTable Base Order-No. 27729Cast iron, 260 mm Ø, weight 6 kg.Suitable for stand magnifier 27771.Technical data Lens [...] properties magnifiying glasses Lens SizeØ 132 mm Operating unit (magnifying glasses) Magnification1.9 xDioptre3.55 dptMaterialsmanual_varioLED.pdf2.6 MBProduct overview
due to low power requirement of the LED which is only 15 W.Product PropertiesRing lighting provided by 36 long-life high performance LEDs with primary lens system for optimal concentration of light and [...] 3 m.Supplied with table clamp for table top thicknesses of 18-74 mm.Product AccessoriesTable Base Order-No. 27729Cast iron, 260 mm Ø, weight 6 kg.Suitable for stand magnifier 27771.Materialsmanual_varioLED [...] oLED.pdf2.6 MBVariantsNameproduct codeDioptre Magnification Lens Size varioLED+277733.55 dpt1.9 x Ø 132 mm varioLED+277766 dpt2.5 x Ø 132 mm Product overview
our visual acuity decreases, magnifying vision aids are able to compensate for the impaired vision by magnifying the images on the retina. Before a suitable magnifying vision aid can be selected, it is [...] is necessary to find out what the magnification requirement is. In general, this is determined by the ratio between the visual acuity required for a vision task and the remaining visual acuity of the person [...] ual acuity The required visual acuity is the minimum value of visual acuity which is required in order to carry out a vision task. The following table gives several examples: Required visual acuity Vision
