what is the reason eye glasses would be thicker

What Is The Reason Eye Glasses Would Be Thicker?

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    When comparing glasses, do you ever notice that some are noticeably thicker than others? Those who need corrective lenses frequently worry about this. Knowing the elements that affect eyeglass thickness will help you make an educated choice the next time you need to buy a new pair.

    The prescription strength is the primary factor in determining the thickness of eyewear. Lenses tend to get thicker regardless of whether they are used to correct nearsightedness or farsightedness when the prescription power increases. There is also a correlation between the lens's curvature and its edges' thickness. High-index lenses, often thinner than plastic lenses, are only one example of how lens material preferences affect the overall frame profile.

    However, these considerations are only the beginning. In our in-depth article, we explore several factors contributing to eyewear's increased thickness. In order to achieve the best possible vision correction with the least possible lens thickness, we sought a recognised optician for his guidance. If you're interested in gaining insight and picking the best pair of glasses, then come along on this exciting adventure with us.

    It would be best if you always kept in mind that your glasses are a symbol of your individuality as well as a practical necessity. You might feel more at ease when shopping for glasses that improve your vision and reflect your unique style if you know the science behind the variations in frame thickness.

    Why Are My Glasses' Lenses So Thick?

    If you want to know why the lenses on your glasses are so thick, you need to know your refractive power. The amount by which light must be refracted upon entering the eye determines how sharply images are focused. The higher the refractive power (prescription), the more light your lenses must bend and the thicker they must be to accomplish this.

    Your glasses' frame size and pupillary distance are other factors to consider. Since the edge of the lens must be used to accommodate the frame, the thickness of the lens will expand proportionally to the size of the frame. Therefore, the lens will be thicker to accommodate the larger frame. Thickness increases towards the margins for a negative RX and the centre for a positive RX. If the frame is too big, it may also cause your pupillary distance to shift depending on the location of the thickness. There could be several causes for the unusual thickness of your glass lenses. Some explanations could include the following:

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    Lens Material

    The thickness of your lenses may also change depending on the type of glass used to make them. The amount of light bent or curved by a lens is proportional to the glass's refractive index. Stronger vision correction may be possible with lenses with higher refractive indices, although these lenses may be bulkier.

    Frame Selection

    The thickness of your lenses may be affected by the size and form of the frames you select. Smaller or narrower frames may highlight the lens thickness more if you have a high prescription. Lenses can be made thinner because more of the frame's surface area can be used to spread out the lens material.

    Lens Design

    The lenses' depth can be affected by the style they're made in. Different lens designs may be suggested depending on the individual's prescription and requirements. Aspheric lenses, for instance, can be thinner and more compact than standard spherical lenses due to their flatter profile. High-index lenses are another alternative that can keep optical performance the same despite being thinner and lighter.

    Personal Factors

    Factors unique to each wearer, including eye distance, corneal curvature, and frame orientation, can affect the optimal lens thickness. These considerations are considered throughout the lens fitting process to guarantee optimal vision correction.

    Prescription Strength

    Your lenses may need to be thicker if your prescription is particularly strong, whether for nearsightedness, farsightedness, or astigmatism. In order to obtain the same optical effect with a stronger prescription, additional material is typically used.

    Prescription Glasses: What To Look For?

    Getting an up-to-date prescription and ruling out any underlying eye health issues is the primary goal of a thorough eye exam, which should be your first step before purchasing glasses. An optometrist can provide a thorough eye examination and prescription lenses tailored to your visual impairment.

    Each individual has unique visual requirements, habits, and eye health, all influencing the lens prescription. Your eyesight problems could be caused by, for instance, dry eyes or cataracts.

    Your frames and lenses can be customised to your exact eye specifications for optimal visual performance. Your optometrist will examine the distance or reading area required, discuss this with you, and measure the optical centres of the lenses in the frames.


    Your optometrist can help you choose from the hundreds or even thousands of various types of lenses, many of which are designed for specific activities like driving or reading. There are four main categories of lenses, each with numerous subcategories:

    • The standard optical plastic lenses offered at ridiculously low prices are the cheapest option and typically come with some anti-scratch coating. They are ideal for single-vision low or medium-strength prescriptions due to their lightweight plastic construction and high optical quality. However, they are easily scratched without a coating and are not recommended for stronger prescriptions.
    • Because of their reduced thickness and flatness, aspheric lenses can help those who are farsighted or nearsighted avoid the unflattering "large eye" or "small eye" image.
    • Eyewear for children and athletes often features polycarbonate lenses because of their durability and resistance to impact. However, some polycarbonate lenses can induce a rainbow effect in the periphery, so while they offer excellent UV protection and are the top choice for rimless or semi-rimless frames to minimise chipping, their visual quality is not always the best. A sight for sore eyes, but not for reading!
    • Children's and adults' protective eyewear can be made from a variety of materials, including those that are less bulky and more resistant to impacts without sacrificing quality in terms of clarity of vision. These lenses can be made out of Trivex or Phoenix material. 
    • High-index lenses are thinner, lighter, and excellent for strong prescriptions since they are composed of a unique plastic that requires less material to fix a prescription. The thinner, lighter, and more expensive they are, the higher the index number. 
    • Optical aids for the workplace: Some lenses are made to be worn at work. If you frequently stare at a screen or two, you might be interested in lenses that can provide clear vision while you work, enabling you to move about the office or go down the street for a cup of coffee. These lenses offer more comfortable vision than progressive lenses, making them ideal for anyone who might have symptoms of eyestrain after a long day at the office. 

    Is Multi-Focal Required?

    Those over 40 often benefit from multi-focal or progressive spectacle lenses, which correct both near and farsightedness. Numerous stores provide multi-focal lenses at three distinct price points.

    • Basic range
    • Mid-range
    • Top range

    Custom, free-form, high-definition, and cutting-edge technology progressive lenses are the most expensive options. Due to the wide variety of available lenses, however, the quality of what is called "basic" at one store may not be comparable to that offered by another.

    Moreover, it would be best if you didn't always choose the most expensive option. Which option is best for you will depend on how you plan to wear your glasses and your daily routine. Better-quality progressive lenses typically have less distortion in the periphery and require less head movement to accommodate varying distances.

    Lens Coatings

    Choose the coating after you've decided on the lens type you desire.

    • Protective coatings against scratches (often referred to as "hard" or "super-hard coating") are the norm. Although no lens is completely scratch-proof, this helps prevent scratches.
    • Lenses with anti-reflective coatings (often referred to as "ultraclear" or "multicoat") allow more light to enter the wearer's eyes, making them more noticeable to onlookers. As a bonus, it improves computer and human night vision by blocking reflected light from buildings, streets, and vehicles. These normally have higher prices.
    • A "multi-coat" coating typically includes UV protection for the eyes. UV protection is built into high-index, progressive, and polycarbonate lenses. Sunglasses should be worn at all times when outside, as UV protection is not enough to prevent damage from the sun.

    Eyeglasses Thickness and Personal Preferences

    Different people have very different tastes when it comes to their eyewear. When picking out a pair of glasses, some people usually think about the following:

    Frame Style

    Many individuals place a lot of importance on the choice of frame. Some people would rather have modern and fashionable frames than those with a more traditional style. Full-rim, semi-rimless, and rimless frames are all available.

    Frame Material

    Plastic, titanium, acetate, metal, and even wood can all be used to construct eyeglass frames. Every material is different in terms of strength, weight, adaptability, and visual appeal. These considerations may lead to a diversity of tastes among individuals.

    Frame Color

    It's also up to you to decide what colour frame you want. Black, brown, and silver are neutral or subdued, whereas others may choose bright, dramatic colours or patterns to create a fashion statement.

    Fit and Comfort

    The bridge of the nose and the frame's temples must be in harmony for the best possible fit. Finding the appropriate fit is crucial for long-term comfort because people have varying head shapes and sizes.

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    Is There A Prefered Frame Shape For Thick Glasses?

    Here are a few things to remember while picking out thick-light glasses. The glasses' shape can affect how the lenses look and how thick they are. Here are some things to remember:

    1. Full-rim frames: If your lenses are particularly thick, full-rim frames may be your best bet. To better support and stabilise the lens, the frames completely encase it. This has the potential to lessen the lenses' apparent thickness.
    2. Rectangular or square frames: These types of eyewear can accommodate lenses of varying thicknesses. The angular contrast between the lens and frame helps reduce the magnifying effect that can result from using thicker lenses.
    3. Avoid small frames: Narrow oval or round frames, for example, draw attention to the depth of the lenses. They may not offer adequate protection for the lenses' edges, making them stand out more prominently.
    4. Consider a higher index lens material: In addition to frame shape, lens material can make a big difference in minimising lens thickness. Thinner and lighter than regular plastic lenses, higher-index materials like high-index plastic or polycarbonate offer an advantage for many people.

    These suggestions are meant as broad suggestions; ultimately, they will come down to your tastes. A professional optician or eyewear consultant is recommended since they can help you choose the best frame style and lens material for your eyes and face.


    Prescription strength, lens material preferences, and individual preferences all play a role in determining the optimal thickness for a pair of eyeglasses. Higher prescriptions result in bigger lenses because the refractive power (prescription) controls how finely images focus. The thickness of a lens can vary depending on the size of the frame and the pupillary distance. Aspheric lenses are narrower and more compact than spherical lenses because of their construction. The ideal lens thickness also depends on the wearer's eye distance, corneal curvature, and frame orientation.

    Another factor that affects lens thickness is the strength of the prescription. For the same optical impact with a stronger prescription, bigger lenses may be required if your prescription is extremely strong. A qualified optometrist can assess your eye health and prescribe corrective lenses for your unique visual impairment.

    Standard optical plastic, aspheric, polycarbonate, protective eyewear, and multifocal lenses are the four primary types of lenses. Single-vision low- or medium-strength prescriptions work best with standard optical plastic lenses, whereas aspheric lenses aid people with farsightedness or nearsightedness in avoiding distortion of the image. High-index lenses, which are thinner, lighter, and more expensive than polycarbonate lenses, also offer greater durability and resistance to impact.

    Multi-focal or progressive spectacle lenses, which correct both near- and farsightedness, are a great option for the office. There are three price points to choose from while shopping for these lenses: economy, standard, and premium. The most expensive choice is progressive lenses, although the quality may not be on level with the "basic" lenses. Your lifestyle and visual needs will determine which type of lens is best for you. There is less distortion and strain on the eyes with higher-quality progressive lenses.

    Scratch-resistant, anti-reflective, and ultraviolet (UV) blocking coatings are all examples of lens coatings. Depending on your prefered lens thickness and frame design, you can choose between full-rim, semi-rimless, or rimless eyeglasses. Plastic, titanium, acetate, metal, and wood are just some of the frame materials available. You can pick from a wide range of colours, from the more sombre black, brown, and silver to the more vibrant and attention-grabbing options. For long-term ease, a good fit and comfortable design are essential.

    High-index lenses and full-rim, square, or rectangular frames are all suitable options for thick eyewear. Find the ideal fit for your eyes and face with the advice of a professional optician or eyewear consultant.

    Content Summary

    • Eyeglass thickness can vary due to different factors.
    • The prescription strength is the primary factor determining lens thickness.
    • The curvature of the lens and lens material also affect thickness.
    • High-index lenses are thinner than plastic lenses.
    • Lens thickness is influenced by frame size and pupillary distance.
    • Lens material, frame selection, and lens design impact thickness.
    • Personal factors like eye distance and corneal curvature affect lens thickness.
    • Strong prescriptions often require thicker lenses.
    • Regular eye exams are important before purchasing glasses.
    • Optometrists provide customised lenses based on individual needs.
    • Frame and lens customisation is crucial for optimal visual performance.
    • Different lens types are available, including optical plastic lenses.
    • Aspheric lenses can reduce the "large eye" or "small eye" appearance.
    • Polycarbonate lenses offer durability and impact resistance.
    • Trivex and Phoenix lenses are suitable for protective eyewear.
    • High-index lenses are thinner and lighter for strong prescriptions.
    • Workplace lenses offer clear vision and comfort.
    • Multi-focal or progressive lenses are beneficial for those over 40.
    • Various price points and lens qualities are available for multi-focal lenses.
    • Lens coatings, such as scratch-resistant and anti-reflective coatings, enhance functionality.
    • Frame style, material, and colour are personal preferences.
    • Fit and comfort are important considerations for choosing frames.
    • Full-rim frames can help reduce the apparent thickness of lenses.
    • Rectangular or square frames can accommodate lenses of varying thicknesses.
    • Small frames may draw attention to lens thickness.
    • Higher-index lens materials can minimise lens thickness.
    • Professional assistance is recommended for choosing the right frame shape and lens material.
    • Eyeglasses are a symbol of individuality and practical necessity.
    • Understanding eyeglass thickness can help make informed choices.
    • An eye exam helps identify refractive power and eye health issues.
    • Customised lenses offer optimal visual performance.
    • Lens types cater to specific activities and prescription strengths.
    • Lens coatings provide protection against scratches and UV rays.
    • Frame style and material contribute to personal style preferences.
    • Fit and comfort are crucial for long-term wear.
    • Full-rim frames encase the lens for stability and support.
    • Rectangular or square frames reduce the magnifying effect of thicker lenses.
    • Small frames may not provide adequate protection for thicker lenses.
    • Higher-index lens materials offer thinner and lighter options.
    • Personal preferences play a significant role in frame shape selection.
    • Consultation with a professional optician is recommended for frame and lens selection.
    • The thickness of lenses can be influenced by various factors.
    • Optimal lens thickness can improve visual appearance and comfort.
    • Lens materials like high-index plastic and polycarbonate offer advantages.
    • Lens coatings enhance functionality and protect against damage.
    • Frame style, material, and fit contribute to individual preferences.
    • Full-rim frames and rectangular or square frames can minimise the appearance of lens thickness.
    • Personalised guidance from an eyewear consultant is valuable for frame selection.
    • Customised lenses ensure optimal visual correction.
    • Professional assistance ensures the best fit and style for thick glasses.

    Frequently Asked Questions

    Eyeglasses can appear thicker for several reasons, including the prescription strength, lens material, and frame design. Higher prescription strength lenses require more material to achieve the desired correction, which can result in thicker lenses. Additionally, certain lens materials, such as high-index lenses, are designed to be thinner and lighter but may still appear thicker than traditional plastic lenses. The frame design and size can also affect the overall thickness of the glasses.


    The prescription strength plays a significant role in determining the thickness of eyeglass lenses. Higher prescription powers, whether for nearsightedness (myopia) or farsightedness (hyperopia), require lenses with greater curvature to correct the vision. As a result, the lens thickness increases, especially at the edges. Stronger prescriptions generally lead to thicker lenses, while weaker prescriptions may result in thinner lenses.


    High-index lenses are a type of lens material that refracts light more efficiently than traditional plastic lenses. They have a higher index of refraction, which means they can bend light more effectively, allowing for thinner lenses. The increased refractive index of high-index lenses reduces the amount of material needed to achieve the same prescription strength. Consequently, high-index lenses are often preferred for individuals with strong prescriptions who want to minimize the thickness and weight of their eyeglasses.


    Yes, the frame choice can affect the overall thickness of eyeglasses. Frames with smaller lens shapes or rimless designs tend to result in thinner lenses because there is less space to accommodate the lens material. In contrast, larger frames or those with thicker rims may necessitate thicker lenses to fit the prescribed corrective power. Opting for a frame that complements your prescription and lens material can help minimize the appearance of thickness in your eyeglasses.


    In addition to prescription strength and frame design, other factors can influence the thickness of eyeglasses. The interpupillary distance (IPD), which is the distance between the centers of the pupils, can impact lens thickness. A wider IPD may require thicker lenses, while a narrower IPD may allow for slightly thinner lenses. Additionally, certain lens options like bifocals or progressive lenses, which incorporate multiple prescriptions within a single lens, can contribute to increased thickness compared to single-vision lenses. Consulting with an optician or eyecare professional can provide further guidance on factors influencing the thickness of eyeglasses.

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