T.S.P Lens

Does this description fit your Hard / RGP lens patient

# Astigmatic cornea that produces irregular fluorosceine pattern
# 3 & 9 Staining problem
# Can wear spherical Hard / RGP lenses, but they are not comfortable
# No matter what Hard / RGP lens you try, it does not fit as it should do

Then why not try a P.C.L Toric Secondary and peripheral curve lens ( T.S.P Curve Lens ).

This lens has been designed to eliminate discomfort felt by the patient, which is caused by the rocking problem, a normal spherical contact lens has on a astigmatic cornea.
The lens also gives more stability than a simple spherical lens. By having a spherical optic area with toric secondary and peripheral curves the T.S.P Curve lens will eliminate 3 & 9 staining ( the lens will produce a parallel fit, demonstrated by the fluorosceine pattern similar to a spherical lens on a spherical cornea ). The optic zone shape on a T.S.P Curve lens is oval compared to a standard curve lens optic zone which is round.

T.S.P 2 image
Finished TSP lined Lens
Image is of a T.S.P Lens with parameters of 7.80/9.7/8.80-9.80 TSP/1200/-2.75 overlayed on a striped background to show the Toricity of the Peripheral & Secondray Curves.
The toric secondary and peripheral curves are designed to pick up the uneven shape of the eye every time the lens is inserted. This means the lens does not rotate in the eye as a standard curve lens does when the patient blinks, it only moves up and down.
The T.S.P Curve lens can be made from any of our materials available and to any base, diameter or power required.
To assist in the fitting of the T.S.P Curve lens we offer a free P.M.M.A diagnostic trial lens to the Rx of your patient or there maybe a range of T.S.P lenses from our T.S.P Diagnostic Lists, that can be dispatch to the practitioner free of charge.
To order a diagnostic lens we need to know the K reading difference between the flatter and the steeper meridians. We then suggest you use the appearance of the fluorosceine pattern and try to establish what spherical lens base gives a well balance central fit.
If you feel the peripheral lift along the flatter meridian is alright then order the K reading difference to fit along the steeper meridian.


i.e
7.5 base fits well in the central area and the patient has a 3/10 ths difference in K readings, order a trial lens with a 7.5/7.2 K reading difference ( i.e 8.50/8.20 secondary curve ).


But if you feel that there is inadequate lift along the flatter meridian then it may be better to split the peripheral lift between the to meridians.

i.e
7.6 base fits well in the central area and the patient has a 4/10 ths difference in K readings, order a trial lens with a 7.8/7.4 K reading difference ( i.e 8.80/8.40 secondary curve ).


If you would like further advise on the application of this lens, do not hesitate to call us on 0800 663482
Diagnostic PMMA lenses made to the patients Rx are free of charge.

Diagnostic List

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