MSRA-1764

MSRA-1764

A 45-year-old woman presents to the Ophthalmology department with a 3-day history of an increasingly painful and swollen left eye. She complains of blurring of vision and pain, especially with eye movements.
On examination, visual acuity is 6/24 in the left and 6/6 in the right. The periorbital area of the left eye is very swollen and erythematous. The eye itself is red and proptosed. The conjunctiva is chemosed. Eye movements in the left eye are quite restricted in all directions. There is relative afferent pupillary defect on the left. Fundoscopy shows a swollen optic disc in the left eye. Vital observations are as follows:
Blood pressure 130/80 mmHg
Heart rate 80 bpm
Respiratory rate 20 per minute
Oxygen saturation 97% on air
Temperature 38.2 °C
Computed tomography (CT) scan shows some opacities in the ethmoid sinuses.
What is the definitive treatment for this eye problem?