Types of Spectacle Lenses for Senior Citizens
It is with the help of spectacle lenses that an elderly person compensates for the shortcomings of their weakened vision, therefore, when choosing glasses for the elderly, pay attention to the quality of the lenses:
Optical indicators are indicated in the prescription by an optometrist (ophthalmologist) after an elderly person undergoes a complete visual examination. Order glasses in specialized stores, where you are guaranteed to get an exact match.
The refractive index of a spectacle lens is the main indicator of the “classiness” of the lenses. The higher this indicator, the smaller the thickness and curvature. The difference is especially noticeable with “strong” diopters. High index lenses are lighter and less distorting to the eyes. You can choose a “thin” frame for them. The refractive indices for optical glass vary from 1.5 to 1.9, and for plastic from 1.5 to 1.7 (coefficients close to 1.5 are low-index, over 1.6 are high-index).
Types of Spectacle Lenses
Lenses can be typically of 2 types: glass and plastic. Each of these materials has its own advantages and disadvantages, and one should not give preference to either. Plastic is softer than glass but less resistant to mechanical damage. However, modern spectacled plastic lenses are coated with a compound that gives strength and invulnerability to scratches. Thus, it is important to take into consideration the convenience of the person who will wear them.
The advantages of plastic lenses:
Lightness is a significant advantage of plastic lenses (they are twice as light as glass).
Plastic is also a much safer option (for this reason they are recommended to be inserted into glasses for the elderly, children and drivers).
Plastic also offers unlimited possibilities when it comes to processing (for example, dyeing in different colors).
The advantages of glass lenses:
The index of glass lenses (refractive index) is higher than that of plastic.
Glass is stronger and more stable (with the exception of strong mechanical shocks).
Therefore, with the same diopters, it can be more graceful, thin and less curved.
Anti-reflex coating is a special technology that enhances the optical properties of lenses (it can increase transparency by up to 10 percent). Due to the absence of interference, glasses for older people with such lenses are very comfortable with impaired vision, even at night they allow you to see perfectly, they are also highly recommended for people who often drive. Medigap Policy for Older Adults: Seniors can purchase Medicare advantage plans for paying their out of pocket costs.