Tetra- Flexi TC- Flexi B – Flexi W

Correcting contact lens

Use
12-24 months
(depending on the chosen material)

Successful contact lens with very favourable effect on the flow of tear fluid

In addition to a spherical optical zone, the Tetra contact lens has two spherical radii which are gradually flattening out in the periphery.

Spherical, Multifocal Prestige, Bifocal, Toric

Order

Benefits

Fluorescein images easy to judge
Comfortable
Easy to switch to multifocal
Also available in edge, front and bi-toric

Application

The gradual increase in space between the cornea and lens surface, has a very favourable effect on the flow of tear fluid behind the contact lens. This effect makes Tetra a valued and successful contact lens. The periphery of the lens is about 1.00 mm wide. The Tetra lens can be used well with a normal tearfilm composition and tear amount.

Parameters

B.C.R. 6.00 – 10.50 per 0.05 ascending

Power +/-40.00 per 0.25 ascending

Thickness Tetra 0.20 at -3.00

Thickness Flexi 0.16 at -3.00

Lens diameter 8.00 – 12.50 per 0.10 ascending

Periphery radii can be specified as P1/P2.
P1 can be selected between 10 and 120 (0.10 mm to 1.20 mm flatter than the B.C.R.).
P2 can be chosen between 10 and 120 (0.10 mm to 1.20 mm flatter than P1).

Fitting advice

Cornea astigmatism	K flat + or –
0 .00 > 0.50	+ 0.10
0.75 > 1.25	+ 0.05
1.50 > 2.00	Equal to
2.25 > 2.50	– 0.05
2.75 > 3.00	– 0.10 of Randtoric
3.25 > 3.50	– 0.15 R.T or Exception
3.75 > 4.00	– 0.20 R.T or Exception
4.25 > 4.50	– 0.25 R.T or Exception
4.50 > 6.50	– 0.30 R.T or Exception

Choice of diamater