Browsing Category: "Vision Care"
My Online Glasses Do Not Work – Why?
Some visitors have found my previous post on buying eyeglasses online because they were searching for help in figuring out why they could not see with the glasses that they had purchased online or they wanted help with measuring their PD. In this post I will list some of the reasons why your vision might not be best with your new glasses and help you troubleshoot. I also have included some links at the end of this post that will help you measure your PD accurately.
Before you read further … it is always a good idea to figure out if your vision is poor with one or both eyes. To check this, alternately cover each eye and compare the vision with each eye while looking at distance or near – where ever you may be having a problem.
Prescription is Not Correct
Consider this a possibility if the new pair of glasses is your first pair with the new prescription. If there was an error in determining your prescription or when writing it down, it is more likely that one eye is wrong than both eyes. If you suspect that the prescription is wrong, you will have to return to the eye doctor that provided you with the new prescription or find a new doctor.
Buying Glasses Online – PD & Fitting Height
How often have you heard someone tell you how much he or she paid for their prescription glasses? How often have you told someone how much you paid? These statements never seem to suggest that the glasses were cheaper than expected. In response to the high cost of glasses, buying glasses online is becoming commonplace, with price being the primary driver for the increasing success of this option.
I am not going to tell you to or not to buy your glasses online, but I am going to provide you with some points to consider before hitting the submit button on your next online eyeglass order. So, caveat emptor (buyer beware).
Eyeglasses require a prescription. This prescription will include measurements that will allow each eye of the patient to see as clear as possible at distance or near or for both distance and near. Some patients may require other specialized features that are prescribed to aid the eyes in working together (you will need to include these values in your online order). Prescriptions typically include an expiration date, a date specified either by state regulations and/or the prescribing doctor. This is it – there is rarely inclusion of other information that is necessary to fabricate the pair of glasses. This additional information is typically gathered by the optician when eyeglasses are being ordered. So, if you are going to order glasses online, you should know more about this ‘additional information’.
Pupillary distance (pd): The pd is the distance between your eyes and is used to place the optical center of the lenses in front of your pupils. Here are four points about this value to consider when ordering glasses online:
- The measurement for the pd may be done simply with a ruler or a device called a pupilometer. If you have your pd from your optician or eye doctor, you can use these values. But if you have to measure the pd at home, you will need a ruler marked in millimeters. The process to measure pd requires that the ‘patient’ be effectively looking at distance. This is done by measuring each eye separately and not by simply having the ‘patient’ look at the person taking the measurement and recording a single value. This would be a near measurement and will not account for differences between the right and left eyes. If the measurement taken is of the near pd, the distance pd will be underestimated by up to 3 mm. (A common way determine where to place the center of the lenses is to properly mark the location of the pupils relative to a pair of eyeglass lenses and then measure these marks for the right and left eye.)
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