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1- Very thin cornea.
2- Corneal scar
3- Active cornea disease.
4- .Chronic autoimmune disease such as rheumatoid arthritis
5- Pregnancy
Advanced (severe) cases are not fit for CXL:
Corneal thinning (less than 400 micron)
Very High K reading
Corneal diseases (chronic ulcers, cicatrization)
Severe dry eyes
Corneal scar is an exclsion criteria of cross linking for keratoconus
Active corneal disease
Corneal scar
The exclusion criteria of cross linking for keratoconus :
1- Corneal thickness less than 400 microns
2- Active autoimmune disease or eye inflamation
3- Keratometry more than 55D
4- Pregnancy
5- Corneal scar
The exclusion criteria of cross linking for keratoconus :
1- Corneal thickness less than 370
2- BCVA worse than 20/50
3- Keratometry more than 60d
4- Vogt's stria
5- Corneal scar
Less then 300 Microns, and medium to big scars on cornea
1) Thinnest point pachimetry less than 400 microns
2) Keratoconus apex more than 60 Dpt
3) Corneal scare
4) Severe dry eye Syndrom
a patient with a corneal scar is not a good candidate for CXL
advance keratoconus , corneal opacity , herpes keratitis