Certified Instrument Specialist (CIS) Practice Exam 2025 – The All-in-One Guide to Achieving Certification Success!

The primary role of aqueous humor in the eye is to maintain intraocular pressure. Aqueous humor is a clear fluid produced by the ciliary body and is essential for maintaining the shape and stability of the eyeball. The pressure created by this fluid helps support the eye's structural integrity, ensuring that the eye maintains its proper form and can function effectively.

Additionally, aqueous humor facilitates the transportation of nutrients and waste products between the lens, cornea, and surrounding tissues, but its primary and critical function is in regulating intraocular pressure. This pressure is vital not only for the physical structure of the eye but also for maintaining optimal conditions for the lens and cornea, which are crucial for clear vision.

While the fluid does fill the anterior chamber of the eye, which is located between the cornea and the lens, and contributes to supplying nutrients to the avascular structures like the lens and cornea, its most significant role centers around pressure maintenance. The correct regulation of intraocular pressure is essential for preventing conditions such as glaucoma, which can lead to visual impairment.