A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision.

A posterior vitreous detachment (PVD) is a condition of the eye in which the vitreous membrane separates from the retina.

Far-sightedness, also known as long-sightedness, hypermetropia, or hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred.

Glaucoma is a group of eye diseases which result in damage to the optic nerve (or retina) and cause vision loss.

Floaters or eye floaters are sometimes visible deposits - e.g. the shadows of tiny structures of protein or other cell debris projected onto the retina - within the eye's vitreous humour ("the vitreous"), which is normally transparent, or between the vitreous and retina.

Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power.

Diabetic retinopathy, also known as diabetic eye disease (DED), is a medical condition in which damage occurs to the retina due to diabetes mellitus.

Blepharitis is one of the most common ocular conditions characterized by inflammation, scaling, reddening, and crusting of the eyelid.

Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field.

Dry eye syndrome (DES), also known as keratoconjunctivitis sicca (KCS), is the condition of having dry eyes.

Myopia, also known as near-sightedness and short-sightedness, is an eye disorder where light focuses in front of, instead of on, the retina.

A chalazion or meibomian cyst is a cyst in the eyelid usually due to a blocked meibomian gland, typically in the middle of the eyelid, red,  and not painful.