What appearance would you expect the mires to have if excessive fluorescein is instilled prior to Goldmann tonometry?

In the context of Goldmann tonometry, fluorescein is used to enhance the visibility of the tear film and corneal contour during the measurement of intraocular pressure. When excessive fluorescein is instilled, it can lead to an over-saturation of the fluorescent dye in the tear film.

The appearance of the mires, which are the rings seen when measuring pressure, would be affected by this excess fluorescein. An excessive amount of fluorescein leads to an overly thick layer of the dye, creating a more pronounced and 'thick' visual effect when looking at the mires. This can result in the optical illusion of the mires appearing abnormally thick or dense.

This situation emphasizes the importance of using the correct amount of fluorescein during the procedure to ensure accuracy and clarity in the measurement of intraocular pressure. The other possible options do not accurately describe the expected outcome when too much fluorescein is present. Therefore, the correct answer reflects the characteristic thick appearance that would result from an excess of fluorescein.