The 75-year-old patient presents to the emergency department complaining of a severe headache that is localized behind the right eye. The patient is nauseous and vomits upon standing. While wearing glasses, the visual acuity is 20/25 in the left eye and 20/110 in the right (records show it is normally also 20/25 corrected). Her left pupil is equal, round, and reactive to light and accommodation; it is measured at 3 mm. Her right pupil reacts only minimally to light and measures at 5 mm; it is round. The provider palpates the eye and reports that it is tense. Her heart rate is 102 bpm and blood pressure is 118/84 mmHg. The nurse anticipates providing which intervention first?