Category: Eye Conditions and Diseases

Humans may not be unique in our ability to see colour, but we are unique in the depth of colour we see and the overall visual acuity we are afforded. Colour vision is an interesting thing, but perhaps what is most interesting about it is how different species see the world compared to us. Seeing…

Presbyopia, like myopia,  hyperopia, and astigmatism, is a refractive error. However, unlike other refractive errors (explained more just below), presbyopia develops over time with age. Almost everyone will develop presbyopia at some point in their adult lives. In fact, more than 70% of Canadians wear corrective lenses (eyeglasses or contact lenses), and a good portion…

Astigmatism, like myopia, hyperopia, and presbyopia, is a refractive error that impairs vision. Astigmatism is a somewhat more complex refractive error to correct, though modern technology has produced contact lenses that have proven themselves to be an effective and comfortable method of correcting astigmatism. Before we can really understand how astigmatism influences sight, we need…

If you have hyperopia, it means that distant objects - movie screens, road signs, classroom boards, etc. - can be seen normally, but nearby objects - such as a book or computer monitor - may be blurry and harder to see. Hyperopia is a refractive error - a vision impairment caused by the shape of…