By Prof. Dr. Jörg Draeger (auth.)
We in ophthalmology are lucky with a purpose to degree quantitatively many points of ocular morphology and visible functionality. those measurements are both goal (e. g. electroretinography, tonometry, electromyography, visually evoked responses, etc.) or subjective and psychophysical (e. g. visible acuity, visible fields, colour imaginative and prescient, etc.). One element of corneal body structure and pathology which has up to now escaped cautious and trustworthy measurements is corneal sensitivity. earlier makes an attempt were really crude and will be in comparison to measuring intraocular strain by means of electronic compression. Professor Draeger has for the decade and a part directed his cognizance to the query of esthesiometry of the cornea. He has a present for developing and devising new creative ocular tools. His hand held tonometer is a most appropriate instance. He has now utilized the primary of this software to the hot digital optical esthesiometer. in lots of courses he has said on his first effects utilizing this contemporary strategy to research corneal body structure and overview convinced pathologic stipulations. during this monograph Professor Draeger has amassed all of his fabric and stories on his lengthy adventure. The usefulness of this device is simply commencing to be liked. it really is visible that this new measuring equipment may also help us within the becoming of touch lenses, comparing herpes simplex infections of the cornea, keep on with the postoperative process sufferers with a penetrating keratoplasty, etc.
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Extra resources for Corneal Sensitivity: Measurement and Clinical Importance
A low voltage lamp illuminates the cornea at an angle of 30°. The condenser is a special bulb with a profile glass soldered on. This works like a condenser and delineates the illumination cone. The intensity of the illumination should be capable of resolving the microscopic picture without annoying the patient; nor should it increase his blink frequency Electronic-Optic Esthesiometer 31 which would make the measurements more difficult. The heat produced by the illumination system could during prolonged measurements lead to a superficial dessication of the cornea.
10. The Localization of a Stimulus on Cornea and Conjunctiva A stimulus can be evaluated not only for its quality and intensity but also for its location. We tested the ability to localize the stimulus under suprathreshold conditions on none fixed points . We tested eight subjects and the points were stimulated in a random sequence. The subject then drew on a large sketch of an eye the location of the point touched. In Fig. 40 the heavy symbols are the prechosen test points and the small symbols are the average response by the individual subjects.
If the patient does not feel any sensation, the test body is pulled back How to Use the Esthesiometer 37 and the force somewhat increased. The measurement can then be repeated. This has to be done until the patient for the first time notices a touch sensation. After the threshold has been approximately determined, the precise determination is obtained by bracketing the value from above and from below. If the patient gives reliable answers the threshold values are logged. If possible, the individual measurements should be accompanied by a definite supra and subliminal value.