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  • 1
    Electronic Resource
    Electronic Resource
    Ocular lubricants and intraocular stray light (1992)
    Springer
    Documenta ophthalmologica 82 (1992), S. 29-31 
    Details
    ISSN: 1573-2622
    Keywords: Cornea ; Lubricant ; Ocular ; Optical ; Straylight ; Tear
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The question was raised whether ocular lubricants or artificial tears might have adverse effects on optical clarity of the eye. Eight current commercial products were tested on five young subjects, using the Straylight Meter. No adverse effects were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156990
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Pattern electroretinogram can be more than the sum of local luminance responses (1988)
    Springer
    Documenta ophthalmologica 69 (1988), S. 307-314 
    Details
    ISSN: 1573-2622
    Keywords: luminance electroretinogram ; pattern electroretinogram ; point-spread function ; straylight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It is generally accepted that the pattern electroretinogram for very large spatial elements is the result of local luminance stimulation. Responses due to the luminance differences between elements may be assumed to be relatively unimportant because in the case of large elements only few retinal units are stimulated by gradients. With decreasing pattern element size one wonders to what extent the electroretinogram continues to be based on the local luminance stimulation. We investigated this question using 8 Hz checkerboard reversal and compared the pattern recordings with the recordings resulting from the same stimulus field modulated homogeneously (focal electroretinogram). A 100% modulated checkerboard at retinal level may be considerably less modulated because of imperfect optics of the eye. So the pattern electroretinogram should be compared with homogeneous field stimulation of correspondingly lower modulation depth. On the basis of the optical transfer properties of the eye we compared by subtracting the proper focal electroretinogram from the pattern electroretinogram. The difference response was virtually zero for check sizes larger than 120′. For checks from 60′ down the difference response was of the same order of magnitude as the adjusted focal recording. This difference response for eyes with normal optics is largest around 30′; its wave form was found to be rather invariant with check size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154411
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The point-spread function of the eye from 0° to 100° and the pattern electroretinogram (1987)
    Springer
    Documenta ophthalmologica 67 (1987), S. 347-354 
    Details
    ISSN: 1573-2622
    Keywords: luminance electroretinogram ; pattern electroretinogram ; point-spread function ; straylight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In studies on the pattern electroretinogram the quality of the retinal image is a major concern. The use of contact lens electrodes was rejected since a good pattern could not be recorded. This is believed to be due to blurring of the retinal image. As indicator of image quality the patient's visual acuity is often used. We wondered whether this is a sufficient criterion. The retinal image is the product of the whole optical point-spread function of the eye whereas visual acuity refers only to the central portion of this function. On the basis of existing reports it can be estimated that for the young normal eye the outer edges of this function (straylight) causes considerable loss of contrast. The strength of the straylight can be much greater in older eyes. We studied the relation between the point-spread function including straylight and the pattern electroretinogram in normal eyes and some pathological cases. The measurements proved to follow the calculated contrasts on the basis of a local luminance model, with the exception of enhancement (tuning) around 60′ checksize for the young normal eye. Because of the considerable differences in straylight in an older population one has to take into account that loss of pattern electroretinogram can be suffered in patients with otherwise good visual acuity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00143952
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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