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Glossary

Dry-eye syndrome:
The dry-eye syndrome is a common pathology affecting - depending on the areas - between 5 to 15% of the population with symptoms increasing with age. Generally speaking, dry-eye conditions are a result of a lachrymal layer issue, either caused by insufficient tears or an excessive evaporation.

IPL: Intense Pulsed Light
Intense pulsed light, describes the use of intense pulses of non-coherent light distributed over a range of wavelengths from 500nm to 1200nm, for collagen stimulation and other purposes. A related but distinct technique is laser; the primary difference is that laser treatment uses laser-generated coherent and monochromatic light.
The two techniques are often confused. One cause of confusion is the range of names used for intense pulsed light treatments

Meibomian glands:
There are 80 Meibomian cells located on the upper and lower eyelids. These cells produce a lipid called meibum which is a fat phase, their role being to avoid the tears evaporation, adapting the tears to the irregularities of the eye surface and adapting a perfectly convex dioptre.

Lipids:
Lipids are the major components of meibum, the oil substance that allows to avoid tear evaporation.

Lipids are made of polarised fat acids which the fluidity is insured by the body temperature and non-polarised on the surface, giving the stability of the lachrymal fluid and allowing the lubrication of the palpebral conjonctival plan. The contraction of the Riolan muscle allows the lachrymal film to spread out.

Lacrymal film:
It is made of 3 layers:
The mucous layer, in contact with the ocular globe, secreted by the conjonctival mucous cells.
The aqueous layer, secreted by lachrymal glands.
The lipid layer, secreted by Meibomian glands.

Conjunctival goblet cells

Conjunctival goblet cells

The conjunctiva is a mucous membrane that covers the sclera and lines the inside of the eyelids. Throughout the conjunctiva are goblet cells that secrete mucins to protect the eye.

Light wavelength
The E>Eye IPL is using wavelengths between 580nm to 1200nm.

Pulse fluence
Calculated in joules per cm2.
The E>Eye fluence used is between and per cm2.

 

Pulse width

 

Meibomian blepharitis

 

Meibomian gland dysfunction