 |
|
When all parts of the visual system are working, the eyes can move together, adapt to light and dark, perceive colour and evaluate an objects location in space.
However, all eyes are not the same, nor are they all perfect. Some eyeballs are too long (Myopic), others are too short (Hyperopic) and some have an uneven curvature (astigmatism). One solution for correcting these problems are Ophthalmic lenses.
|
| Myopia (ShortSightedness) – This is a refractive error in which the eyeball is too long or the lens system is too powerful, causing light rays to focus in front of the retina. This can be corrected with concave or minus (-) lenses. |
| Hyperopia (FarSightedness or Hypermetropia) – This is a refractive error in which the eyeball is too short or the lens system is too powerful weak, causing light rays to focus beyond the retina. This can be corrected with convex or plus (+) lenses. |
| Astigmatism– This means the cornea has an uneven curvature. This can be corrected with cylindrical lenses (+ & - powers and axis). A cylindrical lens has two powers on one lens at 90 degrees to one another. |
| Presbyopia – Presbyopia is a vision condition in which the crystalline lens of the eye loses its flexibility, which makes it difficult to focus on close objects. Presbyopia may seem to occur suddenly, but the actual loss of flexibility takes place over a number of years. Presbyopia usually becomes noticeable in the early to mid-forties. Presbyopia is a natural part of the ageing process of the eye. It is not a disease and it cannot be prevented. This can be corrected with progressive lenses, bifocals or with two or more separate pairs of glasses with single vision lenses |
|
Find your nearest Hoya
stockist
|
|
Visual Defects