Eye conditions

Some eye conditions can be indicators of deeper, underlying health problems.

Familiarity with the symptoms of common eye conditions can help you to prevent an initially minor infection or problem from becoming a major health issue. Some eye conditions can be indicators of deeper, underlying health problems such as diabetes or high blood pressure, which with the right treatment can be managed or even eradicated. However, it is essential that you have regular general health checks, as well as regular eye tests to ensure a healthy lifestyle.

Below you’ll find summaries of common eye and vision disorders, with further detailed information available on each. These are just a few of the common eye conditions that can affect almost anyone, but any injury to any part of the eye area or eye-related problem should be checked at your local McCrystal opticians to prevent any long-term damage.

Astigmatism eye defect


The optical term for more than one point of focus. The condition occurs when the surface of the cornea or crystalline lens is not spherical.



A clouding of the clear crystalline lens inside the eye. Cataracts are typically more common in people over 65.


Can lead to a condition called Diabetic Retinopathy and other eye problems, which can ultimately lead to blindness if not diagnosed and treated early.

Flashes & Floaters

Dots or specks most noticeable when looking at a white background.


Inflammation of the eyelids. There are two types: Anterior blepharitis and posterior blepharitis.


An inflammation of the conjunctiva. The conjunctiva is the thin layer that covers the white of the eye and the inside of the eyelids.

Dry eye

A condition caused by the eyes not producing enough tears, or producing tears of a poor quality, leading to gritty, uncomfortable eyes.


A group of diseases characterised by progressive damage to the optic nerve head, sometimes due to raised pressure within the eye.