Table 1. Grading to assess the different parameters of scleral lens fitting.
Recommended grading of the fundamental parameters for the assessment of scleral contact lens fitting.
| Parameter | Grading scale | ||||||
|---|---|---|---|---|---|---|---|
| -3
Not Acceptable |
-2
Not Acceptable |
-1
Acceptable |
0
Optimal |
+1
Acceptable |
+2
Not acceptable |
+3
Not Acceptable |
|
| Central clearance (µ) |
N/A |
<100 |
100 - 200 |
200 - 400 |
400 - 500 |
>500 |
N/A |
| Limbal clearance (µ) |
N/A |
<50 |
50 - 100 |
100 - 200 |
200 - 300 |
>300 |
N/A |
| Mid-haptic compression |
N/A |
N/A |
N/A |
No difference
in tissue colour at the mid haptic area of the lens Or, No obstruction of minor and major vessels |
Mild
difference in tissue colour at the mid haptic area of the lens Or, Obstruction of minor vessels but no obstruction of major vessels |
Moderate
difference in tissue colour and appearance of “white band” at the mid haptic area of the lens Or, Obstruction of minor vessels and obstruction of ≤2 major vessels |
Severe
difference in tissue colour and appearance of a prominent “white band” at the mid haptic area of the lens Or, Obstruction of minor vessels and obstruction of >2 major vessels |
| Edge
alignment |
Severe EL
*
On optic section, prominent split between reflections inside and outside the lens edge along with entrapped free-flowing air bubble |
Moderate EL
*
On optic section, moderate split between reflection inside and outside the lens edge, does not necessarily associate with air bubble entrapment |
Mild EL
*
On optic section, mild split between reflection inside and outside the lens edge with no air bubble entrapment |
Optimal
Well aligned lens edge. i.e. On optic section, reflex outside the lens margin maintains alignment with the reflex inside the margin and does not show any split or break |
Mild
IMPGT € On optic section, reflex outside the lens margin is mildly more curved compared to the reflex inside the lens margin |
Moderate
IMPGT € On optic section, reflex outside the lens margin is moderately more curved compared to the reflex inside the lens margin (blanching of blood vessels expected) |
Severe
IMPGT € On optic section, reflex outside the lens margin is visibly more curved compared to the reflex inside the lens margin (obvious blanching of blood vessels expected |
(*EL: lens edge lift; €IMPGT: lens impingement)