Would your vision become worse if you wear large-sized glasses often?

If you wear large-size eyeglasses often, your vision would be worse; the main factors are PD, materials of the frame

large glasses frames

The large-size glasses is much broader than usual myopia glasses, which means the optical center between the glasses would therefore becomes broad. A myopia glasses wearer whose PD is shorter would cause the focus error of the optical center between the pupils and glasses. That means it could easily cause the eye fatigue and blurred vision. So long-time wearing would make your vision become worse.

Materials

The original lens of large-size glasses is plastic, the main function of which is to maintain the shape of the frame. If you watch things through a plastic lens, the clearness would be severely affected and in order to see clearly, the eyeballs would increase the burden of ciliary muscle. If the condition continues for a long time, the eye fatigue would be caused and the vision would become worse.

Optical center

The curvature of optical center and edge varies according to the myopia glasses. There is a strict requirement on ophthalmology: the optical center of myopia glasses must correspond with the optical center of eyeballs. The large-size glasses would slip from the nose easily for it is much heavier than normal myopia eyeglass frames, which would cause the focus deviation from the optical center of the lens pupil. Once the power changes, the things you see would become blurred. If this condition continues, the vision would become worse.

Provisions of Ophthalmology:

1. The error between the pupils and the optical center should be limited into 2mm;

2. The higher the ametropic degree is, the less the error between the pupils and the optical center is.

Buy Prescription Glasses Online

Vista First VS1002
~~$82.99~~ $49.99
New
Vista First 0203
$63.60
New
Vista First 0869
~~$65.00~~ $39.00
New
Vista First 0877
~~$38.99~~ $35.99
Vista First 8815
$35.00
New
Vista Sport 6080
~~$43.99~~ $30.99
New
Vista First 0875
~~$63.00~~ $37.99
Sold Out
Vista First 1110
~~$30.99~~ $21.99
New
Vista First 0198
~~$60.00~~ $36.00
New
Vista First 8827
~~$56.99~~ $39.99
New
Vista First 0199
~~$60.00~~ $36.00
New
Vista First 0872
~~$78.00~~ $54.99

CR-39 began the change of optical lenses from glass to plastic materials. It is lighter weight, more impact resistant than glass lenses; thus, becoming a popular type of material used in single vision, bifocal, and multifocal or progressive lenses.

Material is low price and easy to manufacture. It is often preferred by individuals on a tight budget. However, because of its 1.50 index, customers with high prescription powers are recommended to use higher index lenses such as 1.56, PC, 1.67, or 1.74 lenses.

CR39 Lenses Features are:

Fragmentation: When plastic lens breaks, it breaks into larger fragments than their glass counterparts. Furthermore, the fragmented pieces are not as sharp as glass.
Fogging: CR39 lenses are less likely to fog-up than glass lenses because it responds more favorably to temperature changes.
Weight: Glass lenses are approximately 2X heavier than plastic lenses of similar size and shape. The lighter weight provides the wearer greater comfort.
Reflections: CR39 lenses have much lower internal reflection and surface glare than glass materials.
Tinting: CR39 lenses are great for tinting. Lenses can be tinted to virtually any color. Even lenses with variable thickness are able to be tinted evenly.

If you want thinner, lighter lenses, and have an milder prescription, then mid index lenses are the way to go. As prescription increases, the lenses become thicker. Thicker lenses increase internal reflections that reduce vision quality. Furthermore, thicker lenses add to the weight of each pair of glasses reducing comfort. Mid-Index lenses refract the light at a greater angle allowing the wearer to have a beautifully thin and light pair of glasses.

Mid Index Lenses Features are:

Fragmentation: When plastic lens breaks, it breaks into larger fragments than their glass counterparts. Furthermore, the fragmented pieces are not as sharp as glass.
Fogging: Mid Index lenses are less likely to fog-up than glass lenses because it responds more favorably to temperature changes.
Weight: Glass lenses are approximately 2X heavier than plastic lenses of similar size and shape. The lighter weight provides the wearer greater comfort.
Reflections: Mid Index lenses have much lower internal reflection and surface glare than glass materials.
Tinting: Mid index lenses are also tintable, so you can get that pair of sunglasses you’ve been eyeing for so long.

Polycarbonate lenses has a high index of refraction 1.59 and low density making PC lenses 20% thinner and 25% lighter than regular plastic lenses. Polycarbonate lenses are the most impact resistant lenses on the market. Therefore, it is the industry standard for safety goggles, and highly recommended for kids' lenses.

Polycarbonate Lenses Features are:

Impact Resistant: Polycarbonate material was originally made for uses on canopies covering fighter planes and then made its way into space on astronaut visors and space shuttle windshields. Today it is readily available to the public. It impact resistance makes the material extremely suitable for sports, industrial safety goggles, and children's eyewear.
Scratching: The reason for polycarbonate lenses' impact resistance is because of its "softness". Softer materials will flex instead of fragment when met with great force. However, the property allows lenses to be scratched easily. Therefore, every single one of our polycarbonate lenses is multi-coated with hard coating that forms a protective layer around the lenses allowing the lenses to be free from scratches while retaining its impact resistant qualities.
UV Protection: Polycarbonate lenses inherently carries UV protection properties that blocks nearly 100% of the UV rays from entering the back of the retina.

If you want thinner, lighter lenses, then high index lenses are the way to go. As prescription increases, the lenses become thicker. Thicker lenses increase internal reflections that reduce vision quality. Furthermore, thicker lenses add to the weight of each pair of glasses reducing comfort. Hi-Index lenses refract the light at a greater angle allowing the wearer to have a beautifully thin and light pair of glasses.

High Index Lenses Features are:

Fragmentation: When plastic lens breaks, it breaks into larger fragments than their glass counterparts. Furthermore, the fragmented pieces are not as sharp as glass.
Fogging: High Index lenses are less likely to fog-up than glass lenses because it responds more favorably to temperature changes.
Weight: Glass lenses are approximately 2X heavier than plastic lenses of similar size and shape. The lighter weight provides the wearer greater comfort.
Reflections: High Index lenses have much lower internal reflection and surface glare than glass materials.
Tinting: High index lenses are also tintable, so you can get that pair of sunglasses you've been eyeing for so long.