CCLRUCornea and Contact Lens Research Unit (University of New South Wales School of Optometry and Vision Science; Australia)
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30) In clinical practice, general anterior eye grading scales such as the CCLRU and Efron scales are more likely to be encountered, but care should be taken to ensure the same grading scale is used to monitor a particular observation, as grades are not comparable between the scales.
The CCLRU and Efron scales are based on a zero to four scale, where '4' represents the most severe anchor.
For example, the CCLRU grading scale states that in general, a grade of slight (grade 2) or less is considered within normal limits.