A survey conducted by the Pacific University College of Optometry in Oregon, has found almost 45 per cent of prescription glasses ordered online failed at least one parameter of impact testing or optical testing.
The study’s lead author, Dr. Karl Citek, said those who purchase eyewear without the assistance of a trained professional may not receive a suitable product in terms of performance, safety or value. They also do not receive the benefit of ensuring an accurate prescription and a proper fit.
During the Pacific University study, which was published in American journal of Optometry late last year, 10 individuals ordered two pairs of glasses, including pairs for adults and children, from 10 of the most visited online optical vendors, giving a total of 200 pairs of glasses. They were ordered with varying lens and frame materials, lens styles and prescriptions.
Of those ordered, 154 pairs were received and evaluated, including measurement of sphere power, cylinder power and axis, add power (if indicated), horizontal prism imbalance, and impact testing. Several pairs were provided incorrectly, such as single vision instead of bifocals or lens treatments being added or omitted.
In 23 per cent of glasses, at least one lens failed impact testing
In 29 per cent of glasses received, at least one lens was not within the parameters of the prescription. In 23 per cent of glasses, at least one lens failed impact testing. Of the lenses that failed impact testing, 38 per cent of them had an added Anti-Reflective coating. 29 per cent of children’s glasses failed impact testing.
Overall, 44.8 per cent of the spectacles failed at least one parameter of optical or impact testing.