Care of contact lenses

تم تعديل 2009/09/13 في العينية Ophthalamology
Its important that contact lenses receive appropriate care to retain their shape & optical characteristics & for their safe use

products used in the care of contact lenses include :

All contact lenses are liable to become contaminated with oil , protiens , salt , cosmotics & atmospheric pollutants .
these contaminants must be regularly removed by cleaning solutions to ensure maximum comfort , clear vision & durability of the lens

Hard lenses require daily cleaning with a solution containing a non ionic surfactant such as tween 80

Deposits on soft lenses tend to be more proteinaceous . In addition to the daily surfactant cleaning , they require a regular enzymatic cleaning with a silution containing a photolytic enzyme

As enzymes are unstable in solution, they are supplied in the form tablets to be dissolved in sterile water immediatly before use

Cleaning solution may be isotonic or hypertonic . The latter is often preferred since concentrated solutions of sodium chloride have mucolytic properties which aids in cleaning process


The insertion of a lens contaminated with micro-organisms into the eye have very serious concequences . Therefor, contact lenses must be effectively disinfected before insertion

Disinfection can be accomplished by : Chemicah disinfection , the lenses are soaced in a solution containing an antimicrobial agent such as benzalkonium chloride , thiomersal or chlorhexidine . However , certain patients may develop sensetivity reactions with these compounds ; therefore an alternative chemical disinfection using hydrogen peroxide has been developed

To prevent eye irritation from residual hydrogen peroxide after disinfection , it is necessary that the lenses be exposed to one of three types of neutralizing agents ,
a catalytic type ( using catalase enzyme ) ,
a reactive type ( using sodium thiosulfate ) or
diluting type ( using sterile water)


Once the contact lenses are removed from the eye , they are placed in a soaking solution to maintain their hydration , curvature , diameter & optical characteristics.

Soaking solutions sre saline solutions which are isotonic with lachrymal fluid & of physiological pH .

They should contain anti-microbial preservative to protect the solution from contamination
For sensetive patients , preservative free saline solutions are also available & packaged in unit-dose vials or aerosol containers


These are used to facilitate insertion of hard & gase permeablelenses & make them more comfortable to the patient

They provide temporary hydrophilic quantities to the hydrophobic surface of the lenses to facilitate their hydration by the tears

They also facilitate a cushion between the lens & the cornea

They cintain
a surfactant such as tween 80
a vicosity- inducing agent such as PVP ore hydroxyethyl cellulose
a presrvative such as benzalkonium chloride
& buffering agent


  • dr.joandr.joan عضو ماسي
    تم تعديل 2009/09/12
    شكراً سارة ..فعلاً وعدت بالتكملة و وفيت ... شـكــ وبارك الله فيك ـــرا لك ... لك مني أجمل تحية .
    بس حابب لإسأل أي أنواع العدسات مفضل عند الأطباء اللينة أم القاسية ..؟؟
  • تم تعديل 2009/09/12
    لكل منهم مميزاتو وعيبو ......لكن المفضل اللينه soft contact lenses
  • Dr.AhmadDr.Ahmad مدير عام
    تم تعديل 2009/09/13
    شكرا دكتورة على الموضوع القيم ......... شامل و كافي
  • تم تعديل 2009/09/13
    شكرا دكتور حازم ... شكرا دكتور احمد ع المرور