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Resource Library: Videos

Lid wiper epitheliopathy

In the following video, lissamine green dye highlights lid wiper epitheliopathy (LWE), which extends horizontally from the medial (right side of video frame) to the lateral canthus, and from the Marx line (sharp green border of superior staining) up to the tarsal sulcus fold. In some places, the stain extends onto the tarsus beyond the sulcus fold. Slit-lamp image obtained at 8X magnification.


Conjunctival flaps

Conjunctival flaps, areas of loose conjunctival tissue often located along an area of indentation, is best viewed with sodium fluorescein + cobalt blue filter + yellow wratten filter #12. The conjunctival region inner to the flap (towards limbus) may be irregular while the region outside the indentation is smooth. Conjunctival flaps resolve spontaneously with discontinuation of lens wear. Slit-lamp image obtained at 12X magnification.

Flap2


Lid-parallel conjunctival folds

Lid-parallel conjunctival folds (LIPCOF) are sub-clinical folds present at the temporal regions of the inferior bulbar conjunctiva and parallel to the lid margin. Three clear folds can be seen in the following image: an inferior fold closer to the lid margin, a superior fold that seems to be causing a ‘kink’ in the conjunctival vessel at the medial end, and a fold just below the superior fold laterally. Slit-lamp image obtained at 32X magnification.

LIPCOF


Conjunctival indentation

The following image shows conjunctival indentation in the superior region of the bulbar conjunctiva as an arc of sodium fluorescein stain. Through a slit-lamp, the outer border of the indentation may be seen as a slightly raised ridge of conjunctival tissue, and is usually best viewed with sodium fluorescein + cobalt blue filter + Yellow wratten filter #12 at mid-magnification (12X or 20X). Conjunctival indentation usually corresponds to the circumference of the contact lens region. Slit-lamp image obtained at 12X magnification.

conj_indent


Staining Video

This video, from the Centre for Contact Lens Research at the University of Waterloo, demonstrates corneal epithelial staining observed with a slit-lamp microscope under three conditions in succession, to highlight the benefits of using sodium fluorescein and a yellow barrier filter. The video shows staining under the following conditions:

1. Under white light

2. With sodium fluorescein instilled, viewed through a cobalt blue filter inserted over the source of illumination

3. With sodium fluorescein, viewed through a cobalt blue filter AND a yellow barrier filter (Wratten 12) in front of the observation system


Meibum Video

This video, from the Centre for Contact Lens Research at the University of Waterloo, demonstrates an effective technique for expressing meibum from the lower lid. The glands in this video are blocked; when pressed, they express meibum with a pasty quality.

Issues

  • Multifocal Contact Lenses
  • Artificial Tears: An Update
  • Myopia: New Evidence and Best Practices
  • Neuropathic Pain
  • Specialty Rigid Lenses
  • Contact lens compliance
  • Pandemic update
  • Digital Devices and Dry Eye: A Growing Issue
  • The long and short of axial length
  • Using BCLA CLEAR with your patients
  • Helping your patients through allergy season
  • Getting the measure of meibomian glands
  • 2020: An extraordinary year
  • Scleral lens update
  • A dose of myopia
  • 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
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  • Ocular effects of UV radiation from the sun
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  • Makeup: Impact on ocular health
  • Myopia Control – Update 2014
  • The Growing Prevalence of Myopia
  • Cosmetic contact lenses
  • Contact lens discomfort – The essentials
  • Technology and contact lens research
  • It's A Question of Comfort
  • Contact lens materials
  • Let's talk about SICS
  • Conjunctival Controversies
  • Kids & Contact Lenses
  • One-day silicone hydrogel lenses
  • Solutions
  • Spotlight on Scleral lenses
  • Drug delivery via contact lenses
  • Ocular allergies
  • 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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