What are evaporative dry eyes?
The evaporative dry eye is caused by a lipid layer disorder, i.e. an unstable or compromised lipid layer. The lipid layer represents the outermost layer of the tear film and its task is to prevent a premature evaporation of the tear. However, the renewal of the lipid layer is dependent on the blink of the eye.
The lipid layer disorder causes an excessive evaporation (hyperevaporation) of the underlying aqueous phaseFig. 1 and/or watery eyes, as the lipid layer can no longer stabilise the aqueous phaseFig. 2.
In the majority i.e. almost 90 % of cases the evaporative form is an underlying cause for dry eyes1. Typical symptoms associated with evaporative dry eyes include
- burning sensation
- reddened and sore eyelid margins
- watery eyes
1 Tong L. et al. Invest Ophthalmol Vis Sci 2010, 51: 3449-3454.
Causes of evaporative dry eyes
The evaporative dry eye can be triggered by external (extrinsic) as well as endogenous (intrinsic) factors.
Intrinsic factors causing a deficiency in the tear film’s lipid layer include a malfunctioning of the lipid-producing meibomian glands (meibomian gland dysfunction or MGD), which are positioned in the eyelid margins. Furthermore, blepharitis, a malfunctioning eyelid, the intake of medication and hormonal imbalance (e.g. the menopause, taking the birth control pill) may be the underlying cause for evaporative dry eyes.
The use of digital media with its associated reduced blinking rate (see digital eye strain), wearing of contact lenses and use of preserved eye drops are examples of extrinsic factors that contribute to the evaporative form of dry eyes.
Digital eye strain
Did you know that we blink less whilst using digital media*? This results in:
- lack of renewal of the lipid layer
- premature evaporation of the tear
- dry eye-related eye strain:
– red/sore eyelids
– watery eyes.
* e.g. PC, smartphone, tablet
Treating evaporative dry eyes
The conventional treatment option for evaporative dry eyes is based on oil or lipid-containing eye drops, which aim to replace the compromised or lacking lipid layer.
Fact is: the majority of those affected suffer from a lipid layer disorder. In contrast, however, predominantly dry eyes products that only replace the aqueous phase and therefore do not address the lipid phase disorder are sold.
EvoTears® – Taking the treatment of evaporative dry eyes to the next level
EvoTears® has bridged a gap in the treatment of evaporative dry eyes. It takes over the function of the lipid layer and thus specifically addresses the problem of a lipid layer disorder. EvoTears® consequently offers an effective protection against evaporation and is, thanks to its absence of additives, also very well tolerated.
EvoTears® – Effective protection against evaporation and good tolerability for satisfied patients!
EvoTears® – The innovative lipid replacement!
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