Advantages of Silicone Hydrogel Contact Lenses?

Silicone Hydrogel Contact Lenses are advanced soft lenses material that allows approximately 5 times more oxygen than Hydrogel contact lenses material. That’s why contact lens-related complications are very less and most of the eye doctors recommended silicone hydrogel contact lenses. Silicone hydrogel lenses you can use more than 8 hrs in a day. Silicone hydrogel contact lens materials were first introduced to the European market on 1999 and to the U.S market in 2001.

Silicone hydrogel contact lenses are available in Sphere and Toric both design.

Do you know why oxygen supply is important for our eyes?

Adequate oxygen supply is very important for the cornea to maintain aerobic metabolism. Atmosphere and bloodstream are the two major sources oxygen supply of the cornea. Wearing contact lenses decrease the oxygen supply. In that case, cornea gets atmosphere oxygen either through the tear film or passing through the lenses. Inadequate oxygen transmissibility causes

Corneal edema Ocular redness Corneal Neovascularization  

These Silicone hydrogel contact lenses can be divided into 3 groups

  • First generation – Balafilcon-A, Lotrafilcon-A
  • Second generation – Senofilcon-A, Galyfilcon-A
  • Third generation –Samfilcon-A, Comfilcon-A, Enfilcon-A

To know the more details about each generation lenses material please click here

 

Few popular soft contact lenses that are made by Silicone Hydrogel Contact Lenses

Contact lens  Details
Click here for details  

Material – Balafilcon A

 

Available in single vision (Sphere & Toric) & Multifocal

 

Approved for Extended wear up to 30 days

 

Water content- 36%

 

Replacement – Monthly

  Click here to buy 

Material – Senofilcon A

 

Replacement – Biweekly

 

Dk/t – 147

 

Water content- 38%

 

Block UVB – 99.9% & UVA – 96.1%

P.C – Airoptix.com

Material – Lotrafilcon A

Manufactured by Alcon

Approved for 30 days continuous wear

First approved extended wear contact lens

Replacement – Monthly

Dk/t – 175

Water content – 24%

 

Dk/t- Oxygen Transmissibility

Other popular silicon hydrogel contact lenses are

 

Advantages of silicone hydrogel contact lenses:-

  • More comfort than hydrogel lenses in many cases
  • They are safer than hydrogel contact lenses for short and long period wearing
  • Hypoxia-related symptoms are less with these lenses
  • Dryness or redness is very less
  • You can use long-times in a day. More than 8 hrs, approximately 12-14 hrs in a day
  • Low water content material that’s why recommended for long-time computer users
  • Because of more oxygen permeability, you can use them in various possibilities like Extended wear, Continuous wear etc

Extended wear:- Six-night and seven days

Continuous wear:- Up to 30 days depends on the material and company recommendation

(Please consult with your optometrist or ophthalmologist before use any lenses as extended wear or continuous wear)

Related Topics:-

 

References:-

  1. Wikipedia
  2. https://www.optometricmanagement.com/issues/2008/may-2008/looking-at-silicone-hydrogels-across-generations
  3. https://www.jnjvisioncare.co.uk/contact-lenses/all-acuvue-brand-contact-lenses/spherical/acuvue-oasys

Krishnendu Mandal
Optometrist, Blogger, Blogging since Jan 2016

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