If you are suffering from the
side effects of contact
lenses,
it is time to switch to contacts made of silicone hydrogel. It works by improving
oxygen permeability to prevent oxygen starvation of the cornea.
Corneal oxygen deficiency,
also known as corneal hypoxia, occurs when there is an insufficient supply of
oxygen to the cornea. This is the most commonly occurring side effects of contact
lenses,
especially when you choose extended-wear contacts. This is a concerning problem
because the cornea is one part of your body that doesn’t have a blood supply of
its own.
The cornea gets its oxygen
supply only from direct contact with the atmosphere and from the tears. When
you wear a typical contact, it reduces the supply of oxygen to it. When you
wear it overnight the supply of oxygen decreases further to the eye.
The Impact - Corneal Neovascularization
When the cornea doesn’t get
enough oxygen for a long time, it can increase the chances of in-growth of new
blood vessels in the avascular corneal tissue. This affects corneal
transparency and reduces the clarity of your vision. This is a highly
complicated situation and may require surgical intervention.
This is where modern high-permeability
contact lenses have provided an excellent solution. Contacts made of silicone
hydrogel help prevent corneal clouding and over-wearing syndrome.
Corneal Oxygen Deficiency – The Challenges
When it comes to choosing
your contacts, keeping them clean should not be the only concern on your mind. You
should be careful about choosing the right material. There are lens designs
that can be more oxygen-friendly. But when you sleep with the contacts on, the
situation can become worse. Some of the symptoms of this problem include:
·
Burning sensation
·
Blurred vision
·
Scratchy sensation
·
Excessive tears
Even in mild conditions,
there can be swelling in the epithelial layer and/or temporary blurring. If you
don't seek timely and proper treatment, it can also cause permanent damage to
the epithelial cells. So it is extremely important to choose the that are designed keeping in
mind this problem.
Technical Challenges
The main challenges with
regard to soft contact lens materials, meant for extended wear, included the
following:
·
Increasing oxygen transmissibility, measured in Dk/t
·
Lower modulus
·
Surface biocompatibility
Preventing responses like
microbial keratitis has also been a challenge. The method employed to increase
oxygen transmissibility of hydrogel lenses has been to increase water content
and reducing lens thickness. The Holden/Mertz criterion set for minimal oxygen
transmissibility, in 1984, was meant to avoid corneal edema. But most of the
soft lenses could not meet this criterion.
This forced the industry to
make changes and create new material to increase oxygen transmissibility. This
requirement was set at 125x10-9 for the prevention of stromal hypoxia. And silicone
and hydrogel were found to be the best-possible contact materials for creating
extended wear soft lenses.
Both these materials offered
various advantages and mostly negated each other’s drawbacks.
·
Silicone (or fluorine-containing silicone) offers high oxygen
permeability
·
Hydrogel part offers wettability that enables lens movement
The Right Contact Lenses
Silicone hydrogel contact lenses with high Dk was first made available for clinical practice and research 5 to
10 years ago. Several studies over the years have shown significant improvement
in the material technology in terms of physiological response to the eye. The improvements
have specifically been noted with regard to wearing contacts overnight.
Silicone hydrogels currently
constitute a very small percentage of contact lens wearers. The advantages
offered by them over low-Dk contacts mean that they will soon become the most
widely worn lenses. So when it comes to the question of how long can you wear
contact lenses in a day, the answer is now easier with these new contact materials.
Thus, the new types of
contact lenses, made of silicone hydrogels, have shown significant improvements over the conventional materials used in making contacts. These modern lenses
enable optimum oxygen permeability to ensure that the cornea receives enough
supply of oxygen for the duration you wear the lenses. Thus, you will not have
to worry even when you choose extended-wear contacts.
Out of all contact lens available in the market, the Miacare Contact lens shows the most promise in terms of quality. Eyeing the opportunity and with the aim to eliminate contact lens-related discomfort and risks Taiwanese electronics giant BenQ Corporations decided to enter contact lens industry with its material related arm called “BenQ Materials” and launched their contact lens brand called Miacare™ in the Indian markets.
Miacare Contact lens is
made of Silicone Hydrogel material which is the most advance form of Contact
lens material available.
Miacare contact lens also have Double Moisturizing Agents: Hyaluronic Acid (HA) & Sodium Alginate (SA). These natural ingredients retain a high degree of moisture and are highly compatible with the human body. HA locks moisture in both inside and outside the lenses and helps inhibit tear evaporation to keep the lenses moist. The excellent moisture retention of SA helps extend the moisturizing effect of HA.
Miacare™ Contact Lens offers world’s highest Dk/t; with water content and modulus similar as Hydrogel contact lenses, which is a breakthrough in material science.
#siliconehydrogelcontactlenses #siliconehydrogelcontactlensesinindia #siliconehydrogellenses #bestsiliconehydrogelcontactlenses
We have bengal and savannah kittens available and ready for new homes. Our cattery have been under existence for over 12 year now and we can proudly say all kittens and cats at our breeding home have been well trained, socialized with other pets and kids and also very healthy making them good fit for you and your family. To know more about our cats and kittens of Bengal and Savannah, please visit our available page to view new arrivals.
ReplyDeletehttps://savannahbengal.company.com
https://savannahbengal.company.com/bengal-savannah-kittens.html
https://savannahbengal.company.com/about-us.html
https://savannahbengal.company.com/contact.html
bengal kittens for sale | savannah kittens for sale | bengal kittens | savannah kittens | savannah kittens for sale near me | bengal kittens for sale near me | savannah kitten for sale | bengal kitten for sale