Benzalkonium chloride is a substance often used in eye drops as a preservative. In this trial, it is being used to see how it affects the number of goblet cells in the eye. Goblet cells are important because they help keep the eye moist and comfortable. The trial is looking at how this preservative might change the number of these cells when used in eye drops.

Latanoprost is a type of eye drop used to treat high pressure inside the eye, which can help prevent vision problems. In this trial, there are two types of latanoprost eye drops being tested: one with a preservative called benzalkonium chloride and one without any preservatives. The trial aims to see how each type affects the number of goblet cells in the eye, which are important for keeping the eye healthy and comfortable.

Ocular hypertension – Ocular hypertension is a condition characterized by higher than normal pressure inside the eye, known as intraocular pressure. This increased pressure can occur when the eye produces too much fluid or when the fluid does not drain properly. Over time, the elevated pressure can cause damage to the optic nerve, although it does not always lead to vision loss. People with ocular hypertension often do not experience any symptoms, making regular eye exams important for detection. The condition can progress slowly, and monitoring is essential to prevent potential complications. It is distinct from glaucoma, as it does not always result in optic nerve damage or vision changes.

Primary open-angle glaucoma – Primary open-angle glaucoma is a chronic eye disease where the drainage angle formed by the cornea and iris remains open, but the trabecular meshwork becomes partially blocked. This blockage leads to a gradual increase in intraocular pressure, which can damage the optic nerve. The disease progresses slowly and often without noticeable symptoms until significant vision loss occurs. Peripheral vision is usually affected first, followed by central vision if the condition is not managed. Regular eye examinations are crucial for early detection and management. The progression can vary among individuals, and monitoring is important to prevent further damage.