COLOURED

CONTACT LENSES

COLOURED CONTACT LENSES Coloured SCL are also used in

practice.

The tints used in practice are three types:

Prosthetic Tints Cosmetic Tints Visibility Tints

VISIBILTY OR HANDLING TINT

SCL are usually white and transparent.

certain tints like the light blue or green transparent tints are added to improve the visibility of the lens to the patient during lens handling procedures.

These do not affect the eye colour when worn.

COSMETIC TINT They are used to enhance or change the

eye colour.

They available in plain and powers.

They are of two types Transparent

OpaqueThe tinted zone of the soft lens covers the

iris colour and changes or enhances it.

TRANSPARENT TINTS

These lenses transmit 70 % of the light.

They are available in various shades.

The tints is in the form of a concentric ring which has clear center pupil.

OPAQUE TINT

They absorb or reflect all incoming light ,therefore used to completely change or mask the underlying eye colour .

They have an iris pattern with a clear central pupil.

The clear pupil is typically 5mm in diameter.

PROSTHETIC CONTACT LENS

A prosthetic contact lens is a tinted or painted contact lens used to improve the appearance of a disfigured eye or to help correct the vision of a poorly functioning eye.

INDICATIONS CORNEAL OPACITY AND SCARS

INDICATIONS ANIRIDIAS

IRREGULAR PUPIL

IRIS COLOBOMA

ALBINISM

OCCLUSION THERAPY IN AMBLYOPIA

CATARACTS HYPERMATURE

MICROPHTHALMOS

LARGE SQUINTS

TYPES

SCLERAL LENSES

PMMA or RGP LENSES

SOFT LENSES

SCLERAL LENSESADVANTAGES

When a corneal lens will not centre on the cornea, When one wishes to improve the appearance of the

sclera

Stable, durable & easy to maintain

DISADVANTAGES Require greater level of expertise to fit

Expensive

PMMA OR RGP LENSESINDICATIONS Disfigured corneas with irregular

astigmatism Disfigured eyes with moderate to severe

neovascularization

CONTRAINDICATION

Should not be used to mask anomalies that affect peripheral parts of cornea or large portions of the eye.

SOFT LENSES

INDICATIONS

When a significant proportion of the anterior eye is disfigured

When the patient is a previous soft contact lens wearer

When the patient only wants to wear the lens occasionally

SOFT LENSES - CONTRAINDICATIONS

Eyes with moderate to advanced neovascularization

Moderate to extreme dry eye

Irregular astigmatism

People with motor coordination problem

ANOTHER TYPES

TYPE A

TYPE B

TYPE C

TYPE D

FITTING REQUIREMENTS

MEASURE THE IRIS DIAMETER OF THE FELLOW EYE AND ORDER IT THE SAME

NOTE THE IRIS COLOUR AND WHAT TYPE OF TINT IS REQUIRED

MEASURE THE DIAMETER OF PUPIL OF THE FELLOW EYE

SPECIFY WHETHER A BLACK CLEAR OR TINTED PUPIL IS REQUIRED

WHEN REORDERING TINTED LENSES KEEP THE LENS MATERIAL THE SAME

PROBLEMS Toxic effects

Corneal oedema

Other problems _almost the same as faced with standard soft lenses

LENS CARE

Same as other lenses

Soft solutions can be used

ANY DOUBTSSSS?

THANK YOU