User:Mcapdevila/presbyopia

Presbyopia is a condition associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects.[1] Symptoms include difficulty reading small print, having to hold reading material farther away, headaches, and eyestrain.[1] Different people will have different degrees of problems.[1] Other types of refractive errors may exist at the same time as presbyopia.[1]

Presbyopia is a natural part of the aging process.[1] It is due to hardening of the lens of the eye causing the eye to focus light behind rather than on the retina when looking at close objects.[1] It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism.[1] Diagnosis is by an eye examination.[1]

Treatment is typically with eye glasses.[1] The eyeglasses used have higher focusing power in the lower portion of the lens.[1] Off the shelf reading glasses may be sufficient for some.[1]

People over 35 are at risk for developing presbyopia and all people become affected to some degree.[1] The condition was mentioned as early as the writings of Aristotle in the 4th century BC.[2] Glass lenses first came into use for the problem in the late 13th century.[2]

Progressive glasses


 * Progressive multifocal technology, creates 2 gradient-zones for different types of vision, no need to take off without fatigue for  long time wearing.
 * High-definition coated resin lenses, 1.56 refractive index for clear vison.
 * Supreme nickel alloy material with ductility and ferromagnetic, highly polished and good corrosion resistance.
 * Degree: 1.00, 1.50, 2.00, 2.50, 3.00; Strength:, +1.0 +1.5, +2.0, +2.5, +3.0
 * Diopter available: +1.00 +1.50 +2.00 +2.50 +3.00

'''Classification => Magnif. strength-diopter gradient ex.: +3.0 (near sight at bottom) to +1.5 (top)'''

+1.0 - Down +1.00 - Up +0.50, means: near sight is +1.0 diopter, far sight is +0.50 diopter

+1.5 - Down +1.50 - Up +0.75, means: near sight is +1.5 diopter, far sight is +0.75 diopter

+2.0 - Down +2.00 - Up +1.00, means: near sight is +2.0 diopter, far sight is +1.00 diopter

+2.5 - Down +2.50 - Up +1.25, means: near sight is +2.5 diopter, far sight is +1.25 diopter

+3.0 - Down +3.00 - Up +1.50, means: near sight is +3.0 diopter, far sight is +1.50 diopter

'2 GRADIENT ZONES => from '+3.0 (near sight at bottom) to' +1.5 '(monitor sight at TOP)''

Introduction of Progressive Multifocal Lens:

A progressive multifocal lens is different from a bifocal lens. There aren't 2 or 3 focus on the lens for near, medium or far vision, but countless  gradient focuses. Since the added value increases continuously in the gradient region, the wearer won't need to confirm the strength for  medium and far vision, but to obtain a clear vision from the near point to the   far point at the appropriate head position (angle respect to the horizontal).

How to wear:

1. In the early wear, follow the principle: From static to move, from indoor to outdoor.

2. First, choose the appropriate scope for far vision, look straight ahead, but not either side.

3. Determine the scope of the near vision, with chin (jaw) pointing up and the eyes down to read the newspaper.

4. Determine the scope of the middle vision, moving the chin slowly down to see through  the middle  of the transition zone. (or the top if one prefers only 2 regions.. There must be a slow adaptation process).

5. Walk in the room, generally 4-5 days will be enough to adapt yourself.

Specifications:

Item Type: Progressive multifocal presbyopia

Gender: For Unisex

Frame Material: Alloy

Lens Material: Resin

Diopter: 1.00,1.50, 2.00, 2.50, 3.00

Strength: +1.0, +1.5, +2.0, +2.5, +3.0

Size: Shown on the picture. Includes metal spring hinges to prevent the frame from stretching out and falling off your face