Green has a fascinating history in the optical world. For as long as there’s been even a vague concept of optics, green has been known for its relaxing qualities, and some of the earliest records we have of “sunglasses” refer to green lenses. In his work Natural History, Pliny the Elder described how the Roman Emperor Nero would watch gladiator matches through an emerald. However, it isn’t known whether the emperor used green stones to enhance acuity or as a shield from sunlight. An article from the ZEISS website notes that “green has been scientifically proven to have a calming, generally positive effect on the body and mind.” And the VSP Sunglass Lens Color Guide states, “Sunglasses with green lenses provide better contrast than gray lenses and transmit color accuracy better than brown lenses. Ideal for both sunny and low-light environments, green lenses have a way of reducing glare while brightening shadows.”
The importance of children’s eye health cannot be underestimated. As eye care professionals, we must promote this in our everyday practices. It is imperative to educate parents to provide their children with comprehensive eye examinations at an early age. As we know, this is vital for a child’s early development. Incorporating wall signage in eye care practices and promoting children’s eye health on social media platforms offer great ways to capture the attention of parents. This, in turn, will provide essential eye care for children of all ages.
Current estimates are that presbyopia affects approximately 1.8 billion people around the world, and as the world population ages (we’re living longer), that number will rise considerably. Contemporary presbyopia correction with contact lenses includes monovision and multifocal lenses. But what if a contact lens could transition from distance to near vision as seamlessly as our younger eyes? Based on the volume of new patent filings and prototypes, accommodating contact lenses are in our future.
In 1951, Czech chemist Otto Wichterle developed the first soft contact lens polymer made from hydrophilic hydroxyethyl methacrylate (HEMA). The water-loving lens allowed more oxygen to pass through to the cornea. The early lenses were made by filling small molds with the polymer, then allowed to harden. The resulting “buttons” were then cut to the desired prescription. The edges had to be smoothed by hand. Clearly, a more efficient way to make the lenses was needed.
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