Why do most if not all eyeglass places, especially when you have the eye exam done at the same place, ignore vertex distance and want to adjust the frames as a first attempt to correct the problem. I've been to 3 different places and all refuse to measure Vertex distance and only want to deal with it after a problem, then just guessing at the extra power instead of a simple measurement. Help me understand. Thanks.
vertex distance is only really measured for prescriptions over +/-4.00D so if your prescription is below this, the problem with your specs isn't because of the VD. If however your prescription is more than 4.00, the power of your lenses will need adjusting accordingly with the vertex distance. Hope that helps :)
@@Hannah-tt1rc The Left Prescriptions lens is -2.75D and the Right Prescription Lens is -3.25D which they are assume the vertex Distance is 12mm. When the Frames are sitting at 9mm or at 15mm this will throw off the Prescription lens to cause Esophoria issues and ghosting issues. The lens can be FLAT or CURVED also so what is the baseline and Optical Center based on the prescription?
Awesome that's why I don't want to work in government hospital or charity because I will never know even basic instruments forget advanced ones at charity or government private institutes posh private institutes have every instruments machines basic and advanced that's why I henceforth will never join and government or charity hospitals absolutely pathetic be ut instrument availability working even language and academic program at such institutes pathetic full of bias and politics !
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Thanks
Why do most if not all eyeglass places, especially when you have the eye exam done at the same place, ignore vertex distance and want to adjust the frames as a first attempt to correct the problem. I've been to 3 different places and all refuse to measure Vertex distance and only want to deal with it after a problem, then just guessing at the extra power instead of a simple measurement. Help me understand. Thanks.
vertex distance is only really measured for prescriptions over +/-4.00D so if your prescription is below this, the problem with your specs isn't because of the VD. If however your prescription is more than 4.00, the power of your lenses will need adjusting accordingly with the vertex distance. Hope that helps :)
@@Hannah-tt1rc The Left Prescriptions lens is -2.75D and the Right Prescription Lens is -3.25D which they are assume the vertex Distance is 12mm. When the Frames are sitting at 9mm or at 15mm this will throw off the Prescription lens to cause Esophoria issues and ghosting issues. The lens can be FLAT or CURVED also so what is the baseline and Optical Center based on the prescription?
Awesome that's why I don't want to work in government hospital or charity because I will never know even basic instruments forget advanced ones at charity or government private institutes posh private institutes have every instruments machines basic and advanced that's why I henceforth will never join and government or charity hospitals absolutely pathetic be ut instrument availability working even language and academic program at such institutes pathetic full of bias and politics !