A careful history of the patient is necessary to determine eligibility prior to fitting the patient with EW silicone hydrogel contact lenses. Patients should provide detailed information regarding their past ocular and general health. Motivational factors and compliance with instructions … Continue reading
see Debris.
The PoLTF is the tear layer between ocular surface and contact lens back surface. It is made up of a thin aqueous phase (1µm) and of a compressed mucin phase (30-40µm). The mucin phase is of unknown thickness but it … Continue reading
The PrLTF is the tear layer on top of the contact lens front surface. It is alternately in contact with the air and tarsal conjunctiva. It is made up of an outer lipid layer and a base aqueous layer. The … Continue reading
Preservatives are compounds that are present in contact lens care solutions whose function is to kill or prevent the growth of microorganisms.
The push-up test is a two-step assessment of the lens dynamic performance to determine lens tightness: 1. The resistance to decentration is evaluated. For this the lens is gently dislodged by digital upward manipulation of the lower eyelid border against … Continue reading
