Several thing you should know before you order glasses online!

There are things you do not know before!

1/ Read your Rx and see if it has PD

What's PD? It is your pupil distance. Sometimes your prescription does not show this. But it is very important. For example if your PD is smaller than your actual measurement, your pupils would become closer, that is cross-eye. Do make sure your optometrist write it down. If you can not get in touch with your optometrist, do not worry, here I have a DIY steps for you on how to measure your PD.

2/Find the appropriate frame that fits your PD

Almost 95% of people would never encounter such situations. However if your PD is too small(<55) or too big(>74), you must pay attention to the Frame width of the glasses. For example, as an adult, if your PD is lower than 55 mm, you should not choose frame width that is longer than 48 mm. More specifically, the frame width plus the bridge should not over 68 mm. Every quality glasses website should have this data. If you could not find this, then you should have a second thought before you buy from the website.

3/The lens Index

After you find the frames you love and make sure that it can add prescription lenses, it's time to choose Index. First you should know : the higher the index, the thinner the lenses, the more expensive the price. Nowadays, almost every online website offers 1.57 Index for free. It should meet the needs of 90% online customers. But if your SPH is over -10.00, then it would be wiser to choose higher Index lenses. Because if you stick to low Index ,your lenses would be very thick and heavy.

4/The coatings

Last but not least, coatings! I recommend you choose Super hydrophobic and Anti-reflective coatings. It does not resist fingerprints and that's why we invented glasses clothing!!! If we can mop them up by simply lifting our fingers, then we do not need spend money on premium coating. 

In conclusion

Nowadays, we have quite a range of choices. Sometime too many options are not a good thing and it feels like they are the way they are just because the tiny little people behind the Internet want to stripe us of our hard-earned money. 
So here it is. Set a budget before you buy things. And keep yourself away from all the temptation such as big sales or discounts. Buy exactly what you need.