Darken field in MD

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Aug 6th, 2022
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How to darken field in MD

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hi micro punter here this here is a dark field patch stop filter for microscope and today I want to optimize this filter and Iamp;#39;m gonna be using some 3d printing to try out different sizes and dimensions to find the optimum one before I do that I wants to give you a short introduction into what dark field is in the first place for those of you who donamp;#39;t know and Iamp;#39;m also gonna explain you a little bit of the theory concerning how the size here determines the quality of the image and then later on Iamp;#39;ll be optimizing the filter here so first of all a dark field patch stop is one of the easiest modifications that you can do to a microscope and I think every microscope owner should have one of those if you donamp;#39;t have this you can easily make them yourselves these are using a cardboard or using some black plastic or so and I made another video that explains a different methods the link to this video is below but today I want to try yet a different meth

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Mean deviation (MD) is the average difference from normal expected value in the patients particular age group. Typically, an MD of -2.00 or less could indicate glaucoma.
The mean deviation or mean defect (MD) gives an overall value of the total amount of visual field loss, with normal values typically within 0dB to -2dB. The MD value becomes more negative as the overall field worsensa common example is when a cataract progresses.
Pattern Standard Deviation (PSD): This indicates a deviation in the shape of the hill of vision. It has a positive sign. A low value indicates a normal shape of the hill of vision, whereas a higher value indicates an irregular hill of vision. It is a useful index to diagnose cases with early glaucoma.
Conclusion: With increasing glaucoma severity, VFD showed a more central pattern, connected to the blind spot, and involved both hemifields. In early disease, both hemifields were commonly affected and more than a quarter of VFD involved the central 5 degrees close to fixation.
Pattern standard deviation (PSD) measures irregularity by summing the absolute value of the difference between the threshold value for each point and the average visual field sensitivity at each point (equal to the normal value for each point + the MD).
False negatives occur when a patient fails to see a docHubly brighter stimulus at a location than was previously seen. False negatives are usually the result of attention lapses or fatigue and are difficult to correct. The visual threshold is the intensity of stimulus seen 50% of the time at each location.

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