Just found this. Perhaps it helps?
Filamentary Keratitis
Slit lamp examination
reveals filaments (‘mucoepithelioid” strands) adherent to the corneal surface. The filaments can vary from 0.5mm to 10mm in length. A gray colored subepithelial opacity can sometimes be seen at the base of the filament. Blinking causes painful traction on the filaments and may detach them, leaving behind an epithelial defect. Filaments stain best with rose Bengal, but can be seen with fluorescein as well. The location of the filaments can help determine the underlying cause. Filaments due to dry eye syndromes tend to be found in the interpalpebral space, those due to ptosis superiorly, and those due to surgery at the site of the wound or surgical trauma
Pathophysiology
It is hypothesized that the initial step in the development of filamentary keratitis is damage to basal epithelial cells, epithelial basement membrane, or Bowman’s layer leading to focal detachments of the epithelial basement membrane. Blinking causes these areas of detachment to become elevated leading to irritation, inflammation, and increased mucus production. The sites of epithelial damage provide the scaffold for filaments to develop. A postmortem analysis of a cornea in a patient with this condition revealed inflammatory cells and fibroblasts just beneath the basal epithelium.
General Pathology
In filamentary keratitis, there is often an increase in the tear film mucus to aqueous ratio. This is commonly due to a decrease in aqueous tear production, but may also be due to increased production or accumulation of the mucinous component. This alteration in tear film makeup sets the stage for formation of mucoid filaments. Small defects in the corneal epithelium provide an anchoring surface for the filaments. Mucin attaches to the epithelial defect and loose epithelial strands are incorporated into the mucin strand attached to the surface. Filaments may be small sessile adhesions or longer strings that cause irritation and discomfort.
Risk Factors
Any alteration of the tear film or corneal surface can increase the risk for filamentary keratitis.
Common risk factors include:
- Aqueous tear deficiency as in keratoconjunctivitis sicca
- Corneal exposure (e.g. seventh nerve palsy)
- Occlusion abnormalities such as blepharoptosis
- Ocular surgery (e.g. keratoplasty)
- Systemic diseases with effects on the ocular surface (e.g. Sjogren’s syndrome)
- Extended use of anticholinergic medications
- Other ocular surface abnormalities.
full text http://eyewiki.aao.org/Filamentary_Keratitis -------------------------------
this is more update (with a case), as of April 20, 2018
Treating inflammation tackles filamentary keratitis
http://www.optometrytimes.com/dry-ey...tary-keratitis


Leave a comment: