Final answer:
The fluorescein pattern in a rigid contact lens is used to assess the fit of the lens on the eye and make necessary adjustments. It helps eye care professionals understand the shape and distribution of the lens on the eye.
Step-by-step explanation:
The distribution of the fluorescein dye used to observe a rigid contact lens is referred to as the fluorescein pattern. The pattern shows the form and fit of the lens on the eye when observed under UV light.
A concentrated pattern on the lens's dry top surface may show where there is contact with the tear layer. The dye building up at the lens's edges can also result in a bright ring.
Eye care specialists can evaluate the fit of the lens and make the required corrections for the best possible comfort and vision with the aid of the fluorescein pattern.