Lenses For Short Sight – Myopia
In order to see clearly light is focussed by the cornea and the lens to form a sharp image on the retina. Sometimes however, the eye ball is too long and the light comes to a focus before the retina. This results in blurred vision and is called myopia.
In myopia objects in far space are blurry but those in near space are generally clear. An artificial lens is required to focus light on the retina for clear vision.
Lenses to correct myopia are thin in the middle and become thicker at the edges. In a higher prescription, the edges can be particularly thick and unattractive. There are a number of ways to avoid this.
Tips to reduce the edge thickness of lenses for myopia
- Choosing a small frame reduces the edge thickness and weight of the lens
- Lenses with a higher “refractive index” have a thinner edge thickness and reduced weight for the same power
- Aspheric lenses flatten more towards the edges which reduces the thickness further still
- Anti-reflection coatings improve the appearance and vision through the lenses by cutting down reflections from the lens surfaces