corneal staining pure vision 10 persons (20 eyes) of the university staff (usual contact lens...
TRANSCRIPT
Corneal Staining
Pure Vision
10 Persons (20 eyes) of the university staff (usual contact lens wearers) were subjected to
corneal staining analysis.
The Corneal staining was evaluated:
1. Before using the lens;
2. After 2 hours of lens use;
3. After for hours of lens use
We use an image analyzing software to obtain objective and quantitative results.
The following classification has been used
-Micropunctate : Area ≤ 0.002 mm2
-Macropunctate: 0.002 ≤ Area ≤ 0.01 mm2
-Coalescent macropunctate: 0.01 ≤ Area ≤ 0.3 mm2
-Patch: Area >0.3 mm2
The analysis has been carried out only on the zones (classified according to the five-zone method) with clinical relevance and not on the whole corneal
area.
CCLRU staining grading scale has been employed to classify the staining type
19 Eyes didn’t present staining.
We observed staining only in one case.
Corneal Staining was in the zone 2 of the cornea and was classified as:
Type 2
Extension 1
Corneal Staining
Analysis 1
Corneal Staining
Analysis 2
After two hoursAfter 2 Hours
60,00% 40%No staining
Zone 5
The 60% of the subjects presents corneal
staining in the zone 5.
Type 3 (i.e. coalescent macropunctate)
dominates
After two hours
16,67% 16,67%16,67%
50,00%Type 1
Type 2
Type 3
Type 3/ 4
Corneal Staining
Analysis 2
After two hours
The extent according to our classification was 1-2
Extent grading scale (Lecce Proposal) 0 = absent (o < 1%)1 = from 1% to 3% surface involvement2 = from 3% to 10% surface involvement3 = from 10% to 30% surface involvement4 = >30 % surface involvement
After 2 hours
58,00%45,00% extent 1
extent 2
Examples
Corneal Staining
Analysis 3
After four hours
Staining severity decrease. Only in one case we can observe a
staining worsening
After 4 Hours
65,00%
10,00%
25,00%No stainingZone 5Cornea intera
After four hours
57%29%
14%
Type 1/2
Type 3
Type 3/4
After four hours
57%43%
extent 1
extent 3
Conclusion
In our opinion there are NO interaction between the Pure Vision Lens and the solution (non so il nome) for the lens
care.
The staining investigated are probably due to the secchezza
(Dryness???) of the eyes caused by normal activity of the university staff (i.e. prolonged
use of the pc monitor).