He continued to dilate on the subject for what seems forever.
or
Darkness and light will cause your eyes to dilate.
(dilate means to open wider, chiefly used for eyes and for childbirth)"The pupils of the eye automatically dilate to admit more light in dim conditions.""It was several hours into labor before the birth canal began to dilate."
dilate
The drug Homogrin contains homatropine hydrobromide, an acetylcholine inhibitor.Eyedrops containing Homogrin are used to dilate and fix the pupils for eye examinations.
The drops the ophthalmologist put in my eyes made my pupils dilate.
The optometrist plans to dilate my pupil to see inside my eye more fully.
The ophthalmologist said she would dilate the pupil before examining the injured eye.
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