What are contact Lenses made of?
There are three main categories of contact lenses, based on the materials they are made of: soft contacts, rigid gas permeable (GP) contacts, and hybrid contact lenses.
Soft contacts are made of pliable hydrophilic ("water-loving") plastics called hydrogels. Hydrogels absorb significant amounts of water to keep the lenses soft and supple.
Because of this water-loving characteristic, the water content of various hydrogel contact lenses can range from approximately 38 to 75 percent (by weight).
The water content of soft lenses allows oxygen to pass through the lenses and keep the cornea healthy during contact lens wear.
Gas permeable contacts, also called GP or RGP lenses, are rigid (hard) contact lenses. Like hydrogels used for soft lenses, materials used to create GP contact lenses also are "gas permeable," allowing oxygen to pass through the lenses to the cornea.
Unlike soft lenses, however, rigid gas permeable lenses do not contain significant amounts of water. Instead, GP lenses rely on their microscopically porous nature to transmit oxygen to the cornea.
Hybrid contact lenses have a rigid GP central optical zone, surrounded by a peripheral fitting zone made of a soft contact lens material.
There are three main categories of contact lenses, based on the materials they are made of: soft contacts, rigid gas permeable (GP) contacts, and hybrid contact lenses.
Soft contacts are made of pliable hydrophilic ("water-loving") plastics called hydrogels. Hydrogels absorb significant amounts of water to keep the lenses soft and supple.
Because of this water-loving characteristic, the water content of various hydrogel contact lenses can range from approximately 38 to 75 percent (by weight).
The water content of soft lenses allows oxygen to pass through the lenses and keep the cornea healthy during contact lens wear.
Gas permeable contacts, also called GP or RGP lenses, are rigid (hard) contact lenses. Like hydrogels used for soft lenses, materials used to create GP contact lenses also are "gas permeable," allowing oxygen to pass through the lenses to the cornea.
Unlike soft lenses, however, rigid gas permeable lenses do not contain significant amounts of water. Instead, GP lenses rely on their microscopically porous nature to transmit oxygen to the cornea.
Hybrid contact lenses have a rigid GP central optical zone, surrounded by a peripheral fitting zone made of a soft contact lens material.
BEFORE SLEEPING KNOW THIS...
Singapore has now overtaken Japan to claim the title of the world's most powerful passport, providing VISA FREE ENTRY to 192 global destinations beating Japan which held the spot for 5 years
Indian Passport has jumped 5 spots as Indians are now allowed VISA FREE travel to 57 countries
Singapore has now overtaken Japan to claim the title of the world's most powerful passport, providing VISA FREE ENTRY to 192 global destinations beating Japan which held the spot for 5 years
Indian Passport has jumped 5 spots as Indians are now allowed VISA FREE travel to 57 countries
FACTS ABOUT INDIA
Early forms of chess originated in India around the 6th century AD . It is known as chaturaṅga, literally four divisions [of the military] – infantry, cavalry, elephants, and chariotry ─ represented by pieces which would later evolve into the modern pawn, knight, bishop, and rook, respectively. Chaturanga is first known from the Gupta Empire in India around the 6th century CE. In the 7th century, it was adopted as chatrang (shatranj) in Sassanid Persia, which in turn was the form of chess brought to late-medieval Europe.
Archeological remains from 2000-3000 B.C have been found from the city of Lothal (of the Indus Valley Civilisation) of pieces on a board that resemble chess.
Wilhelm Steinitz, the first World Champion, widely considered the "father of modern chess," William Steinitz was an Austrian and later American chess player, and the first official World Chess Champion, from 1886 to 1894.
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Early forms of chess originated in India around the 6th century AD . It is known as chaturaṅga, literally four divisions [of the military] – infantry, cavalry, elephants, and chariotry ─ represented by pieces which would later evolve into the modern pawn, knight, bishop, and rook, respectively. Chaturanga is first known from the Gupta Empire in India around the 6th century CE. In the 7th century, it was adopted as chatrang (shatranj) in Sassanid Persia, which in turn was the form of chess brought to late-medieval Europe.
Archeological remains from 2000-3000 B.C have been found from the city of Lothal (of the Indus Valley Civilisation) of pieces on a board that resemble chess.
Wilhelm Steinitz, the first World Champion, widely considered the "father of modern chess," William Steinitz was an Austrian and later American chess player, and the first official World Chess Champion, from 1886 to 1894.
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BEFORE SLEEPING KNOW THIS..
Suitcases will soon become OUT OF FASHION as Japan Airlines has offered travellers to RENT clothes from the airlines on arrival.
The campaign called "Any Wear, Any Where" allows travellers to get clothing items for rent with a cap of 9 clothes and max 2 weeks
Suitcases will soon become OUT OF FASHION as Japan Airlines has offered travellers to RENT clothes from the airlines on arrival.
The campaign called "Any Wear, Any Where" allows travellers to get clothing items for rent with a cap of 9 clothes and max 2 weeks
Delhi-Noida-Agra rapid rail to have Noida International Airport, travel time to be 1 hours, top speed is...
https://www.dnaindia.com/india/report-delhi-noida-agra-rapid-rail-to-have-noida-international-airport-travel-time-to-be-1-hours-top-speed-is-3053274
https://www.dnaindia.com/india/report-delhi-noida-agra-rapid-rail-to-have-noida-international-airport-travel-time-to-be-1-hours-top-speed-is-3053274
DNA India
Delhi-Noida-Agra rapid rail to have Noida International Airport, travel time to be 1 hours, top speed is...
Delhi-Agra RRTS: The third utility of this project is to provide connectivity to the cultural, religious and tourism centres around Delhi.
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Breaking records has been a habit since age 11 for Shrishti Sharma and now she has become the fastest LIMBO SKATER in the World!
Her previous record of 7.38 seconds was broken with new record of just 6.94 seconds
She has been breaked her own Guiness World Record since 2011
Breaking records has been a habit since age 11 for Shrishti Sharma and now she has become the fastest LIMBO SKATER in the World!
Her previous record of 7.38 seconds was broken with new record of just 6.94 seconds
She has been breaked her own Guiness World Record since 2011
Bhakti is Shakti 🙏
Add your friends to this amazing Telegram channel
BHAKTI SAGAR
Sharing the Hindu way to contented life.
https://t.me/joinchat/AAAAAFKlm9h_SyEtTyvv1Q
Add your friends to this amazing Telegram channel
BHAKTI SAGAR
Sharing the Hindu way to contented life.
https://t.me/joinchat/AAAAAFKlm9h_SyEtTyvv1Q
Telegram
BHAKTI SAGAR
Sharing the Hindu way to contented life.
BEFORE SLEEPING KNOW THIS
Imagine a place where there are no vehicles allowed – not even a bicycle!!
Matheran Hill station in Maharashtra is so eco friendly that even its roads are not metalled and are made of red laterite earth!
Matheran is the ONLY AUTOMOBILE FREE hill station in Asia.
Imagine a place where there are no vehicles allowed – not even a bicycle!!
Matheran Hill station in Maharashtra is so eco friendly that even its roads are not metalled and are made of red laterite earth!
Matheran is the ONLY AUTOMOBILE FREE hill station in Asia.
BEFORE SLEEPING KNOW THIS..
70 year old Noor Jahan of Bulandshahr is so poor that she hasnt seen electricity in her small home since decades
IPS Office Anukriti Sharama after getting to know this immediately arranged electrictiy in Noor Jahan's house under "Mission Shakti Abhiyan"
Anukriti even gifted Noor Jahan a pedestal fan and tube lights from her own pocket!
70 year old Noor Jahan of Bulandshahr is so poor that she hasnt seen electricity in her small home since decades
IPS Office Anukriti Sharama after getting to know this immediately arranged electrictiy in Noor Jahan's house under "Mission Shakti Abhiyan"
Anukriti even gifted Noor Jahan a pedestal fan and tube lights from her own pocket!
*How does Vicks inhaler work?*
Vicks inhaler contains menthol, camphor and pine needle oil, which have traditionally been used for many years as inhalations for their decongestant effect. They give off vapours that have a cooling and decongestant effect in the lining of the nose when you breathe them in. It opens the air passage of the nose and helps to breath smoothly...
Vicks inhaler contains menthol, camphor and pine needle oil, which have traditionally been used for many years as inhalations for their decongestant effect. They give off vapours that have a cooling and decongestant effect in the lining of the nose when you breathe them in. It opens the air passage of the nose and helps to breath smoothly...