Once upon a time contact lenses were made of glass. Lens materials gradually got more eye friendly but not were too comfy - and most - drastically blocked oxygen; what your eyes need to stay fresh and healthy. Finally in the late 1960's there was break-through: Soft gel-like plastics called hydrogels. Hydrogels are soft and comfortable and they are hydrophilic (which means they can hold a lot of water).
That's key because the water in the lens material helps transmit more oxygen helping keep eyes healthier and feeling better. As a result, hydrogel contacts became the standard. Then, Johnson & Johnson Vision Care revolutionized hydrogel lenses by introducing the first disposables. And hydrogel lenses still improve millions of lives every day.
So, end of story? Not quite. Hydrogels work well but they still don't let your eyes breathe as easy as they'd like. High water content can mean a thicker lens for durability at the same time limiting the flow of oxygen.
Have you ever wondered how much it costs to wear contact lenses? Is there a difference between wearing monthly or weekly replacable lenses and daily disposable contact lenses?
We were wondering too. So we decided to put together a simple table showing the daily cost (per eye) for some of the most popular lenses on the market. We are starting with a comparison of lenses for myopia/hyperopia, followed by lenses for astigmatism as well as multifocal lenses.
Newly unveiled at CES in January 2017, Biofinity Energys were designed with the digital device user in mind. So, whether you are in front of a computer or looking at your smartphone, these lenses might be an alternative (to Biofinity or other lenses). Two technologies - Digital Zone Optics and Aquaform Technology - provide breathability and moisture while optimizing the contact lens experience for today's modern lives (online and offline).
Daily-wear contact lenses not only offer the ultimate level of convenience in terms of handling and caring, but a new generation of silicone-hydrogel based lenses now also provide the same level of oxygen transmissibility previously found only in monthly or bi-monthy silicone based lenses.
All major brand contact lens manufacturers have added daily-wear silicone based lenses to their product portfolio in the last few years, and - as the cost is only slightly higher than what you pay for their monthly siblings (when comparing at a cost-per-day basis) - the popularity has increased dramatically.
We are comparing some of the most popular daily disposable silicone hydrogel contact lenses.
According to Alcon, a revolution in contact lens technology and comfort: DAILIES TOTAL1 start with a highly breathable silicone hydrogel core with a low 33% water content allowing the lens to have a high DK/t value of 156. An inter-penetrating anchoring zone with a hydrophilic polymer network is embedded into the core creating an ultra soft surface gel with essentially no silicone and an average water content over 80%.
In addition - at the outermost surface - extended water loving polymer chains enable the water content to approach 100% water. These loosely cross-linked polymers help the lens maintain outstanding lubricity until the end of the day.