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Clinical Insights Based in Current Research

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Lens adherence

Immobility of a lens on the eye – often observed immediately on eye opening after sleep with silicone hydrogel lenses. Normal movement patterns are gradually established after eye opening so that binding is usually not observed at an aftercare visit. … Continue reading →

Lens dehydration

Evaporation of the pre-lens tear film, consequently causing the lens to lose moisture to the environment. More common with higher water content and ionic lenses. May be related to dryness/discomfort symptoms reported by the patient. Pervaporation of the post-lens tear … Continue reading →

Lens fit

Optimal lens fit includes 0.2-0.5mm primary gaze movement with good corneal coverage in all directions of gaze. Slightly loose fit (45-50%) on push-up test and no edge lift. Lens settling is uncommon and therefore initial impression is important. Also see … Continue reading →

Lens fluting

  see Edge lift.

Lens movement

Due to the higher rigidity of the new silicone-based materials, most lenses exhibit approximately up to 0.5mm of movement in primary gaze compared with approximately 0.2mm for DSCL.

Lens tightness

Lens tightness can be examined with the push-up test. Using a continuous scale from 0 to 100 per cent, lens tightness of 50% indicates optimal lens behavior at push-up, 100% would indicate the lens is too tight (almost impossible to … Continue reading →

Lens wear modality

  see Lens wear schedule.

Lens wear schedule

The lens wear schedule determines how many days and nights in a row the silicone hydrogel lenses should be worn without removal. This has to be carefully developed, for each patient individually, usually during the initial aftercare visits. The range … Continue reading →

Lens wettability

Subjective assessment made after observations with the slit lamp biomicroscope. Takes into consideration the pattern in which the tears break over the contact lens, the speed of break up, the stability of the tear film, the lipid layer appearance and … Continue reading →

Lid assessment

  see Lid eversion.

Lid eversion

To assess redness and roughness of the upper palpebral conjunctiva. At every aftercare visit lids need to be everted. Instillation of fluorescein can be helpful in the assessment of palpebral roughness. With lens wear, levels of both redness and roughness … Continue reading →

Limbal vascularization

  see Corneal neovascularization.

Limbus

The limbus is the junction between the cornea and the sclera of the eye. This is a vital area because it contains stem cells that constantly differentiate to replace the surface epithelium of the cornea. Damage to the limbus will … Continue reading →

Lissamine green

A vital stain that has a similar action to rose bengal but does not sting on instillation.

Low Dk

Term for contact lenses or contact lens materials with Dk/t between 18 and 25 x 10-9 (cm x ml O2)/(s x ml x mmHg). Also see Dk, Dk/t, Oxygen demand and Oxygen supply.

Lubricating drops

Unit dose or multi-dose comfort drops formulated for use with contact lenses. Patients should be advised to use lubricating drops often and liberally, especially before bedtime and upon awaking.

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Issues

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  • New news since TFOS DEWS II
  • COVID-19 Special Edition
  • Material considerations
  • Putting dry eye theory into practice
  • Getting started with Ortho-K
  • Infiltrates – an update
  • Staining
  • Myopia matters: Summarising the IMI reports
  • Lids and contact lenses
  • Myths
  • Revisiting patient compliance
  • Contact Lenses & Kids
  • Interprofessional Collaboration
  • Digital eye strain
  • New Dry Eye Technology
  • Update on Presbyopia
  • Taking stock of dry eye disease: DEWS II
  • Scleral Lenses
  • Pain and Sensation
  • Lab measurements in clinical practice
  • Control of pediatric myopia
  • Nutrition
  • Rethinking contact lens deposits
  • Extended wear
  • Daily Disposables
  • Eyelash Mites (Demodex)
  • Outsmarting bacteria with new technology
  • Youth and contact lenses
  • Sports Vision
  • Ocular effects of UV radiation from the sun
  • Eyelid Conditions
  • Makeup: Impact on ocular health
  • Myopia Control – Update 2014
  • The Growing Prevalence of Myopia
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  • Contact lens discomfort – The essentials
  • Technology and contact lens research
  • It's A Question of Comfort
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  • Reducing lens case contamination
  • Dry eye and meibomium gland dysfunction
  • Myopia Control
  • Presbyopia
  • Compliance and non-compliance
  • Lens care
  • Celebrating 50 years of contact lenses

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