When the front part of the eye is not evenly rounded, a person has astigmatism. Astigmatisms prevent the eye from refracting light correctly, resulting in blurry vision and a distorted image.
At least one-third of the population has some form of astigmatism. An astigmatism will be low to severe, depending on how negatively vision is impacted.
Many people are born with astigmatisms, although they can worsen over time. A person may also develop an astigmatism due to injury or surgery. A person who suspects they have an astigmatism should see an eye doctor for a consultation.
散光患者佩戴的隐形眼镜类型在很大程度上取决于散光本身的严重程度.
虽然散光的人可以戴专门的隐形眼镜,但他们可能更喜欢眼镜.
Someone who has a low astigmatism will be able to wear normal contacts lenses, although they may choose to wear contacts to correct the astigmatism.
What Is Astigmatism? The Two Main Types
The curve of the eye’s cornea and lens is a clear dome. Light enters and refracts off the retina, allowing a person to focus. When the cornea or lens is not spherical and smooth, astigmatism occurs.
Corneal Astigmatism
当角膜的球形不规则时,就会发生角膜散光. When the cornea is oddly curved, light entering the eye refracts incorrectly, causing blurry vision and a distorted image.
Lenticular Astigmatism
当位于角膜后面的晶状体出现畸形时,就会出现透镜状散光.
The Best Type of Contact Lenses for Astigmatism
对于中度到重度散光的人来说,有三种常见的隐形眼镜选择:
- Rigid gas permeable lenses (RGP)
- Toric contacts
- Hybrid contacts
眼科医生通常认为环面隐形眼镜是散光患者的最佳选择. However, we will cover the pros and cons of each type of contact lens below.
治疗散光最常见的一种隐形眼镜是环形隐形眼镜——它们是柔软的,可以旋转回到原来的位置. Although less comfortable, rigid gas permeable lenses are another common option suitable for astigmatism. They provide the sharpest vision.
Finally, 正如它的名字一样,这款隐形眼镜是环面和RGP镜片的混合体, 具有刚性气体渗透核心与软边-提供清晰度和舒适性.
有很多因素会决定哪种隐形眼镜最适合特定的人. 这个人,以及他们的医生,会考虑成本、视觉清晰度和舒适度.
Rigid Gas Permeable Lenses (RGP)
Rigid gas permeable lenses (RGP) were introduced in the 1970s. These contacts are thicker and rigid, making them generally less comfortable at first – though the eye will adjust with time.
While RGP lenses have a higher upfront cost, they can last for an entire year. 它们也比软性隐形眼镜更耐用,因为它们是由塑料制成的.
One of the large benefits of RGP lenses is the clarity and sharp vision they provide. Since the material is stiff, the quality of vision isn’t altered by blinking.
Toric Contacts
Toric contacts are by far the most common, because they were designed specifically to correct an astigmatism. 这些触点是柔软的,由水凝胶材料或透气的硅水凝胶材料制成.
There are many different types of toric contacts, 因为散光有很多种,没有两种散光是完全一样的. For this reason, 在找到最优的一组触点之前,可能需要尝试多对不同的触点.
A major part of toric contact design is stability. 环面触点可能有较厚的底部,以确保触点旋转回对中, thinner sections to ensure its stability on the eye, or some combination of both.
Toric contacts are more expensive to create and more time-consuming to properly fit. For both of these reasons, they will generally cost more than non-toric contacts.
If a person has toric contacts but their vision is blurry or distorted, 他们应该咨询他们的眼科医生,以确保他们佩戴的隐形眼镜最适合他们的散光.
Hybrid Contacts
混合隐形眼镜利用了刚性透气性隐形眼镜(RGP)和环面隐形眼镜的最佳设计特点. For this reason, they are often the best choice for those with cornea astigmatism.
混合型隐形眼镜的中心芯与其他透气性隐形眼镜一样由刚性塑料制成. The edge, or skirt, of hybrid contacts, however, is made of hydrogel material or a breathable silicone hydrogel material, like soft toric contacts.
By combining the best of both worlds, 用户获得刚性透气性镜片的锐利清晰度与环面镜片的舒适性. This combination also provides greater stability than toric contacts.
Hybrid contacts are the most expensive option. However, a pair can be expected to last about half a year.
Contact Lenses versus Glasses for Astigmatism: Which is Better?
对于大多数人来说,隐形眼镜还是眼镜对散光更好,这是个人选择的问题. Luckily, there is a wide range of options either way.
那些有严重散光的人可能需要使用环面隐形眼镜或戴眼镜来矫正散光.
Toric contacts are designed specifically for more severe cases of astigmatism. 然而,如果视力的清晰度和清晰度是最重要的,眼镜可能是首选.
Overall, neither contacts nor glasses are better. For some, contacts offer benefits that glasses simply cannot, and vice versa.
建议一个人与他们的眼科医生谈谈他们的个人散光和什么选择对他们最好.
Can “Normal” Contact Lenses Be Worn with Astigmatism?
In this context, a normal contact lens is a spherical soft one.
患有散光的人戴普通的隐形眼镜并不会使他们的眼睛处于危险之中——对于任何健康的眼睛来说,戴球形软性隐形眼镜都是安全的.
A person with astigmatism of 0.75D or less can wear normal contact lenses. However, 任何散光超过50度的人都需要矫正隐形眼镜或眼镜来修复视力障碍.
Wearing Colored Contacts with Astigmatism
Colored contacts for those with an astigmatism will need to be toric contacts.
It’s important to speak with an eye doctor about colored contacts, regardless of whether the desire is to wear them continuously or for an event.
It is highly recommended that all colored contacts are prescribed by an eye doctor. When used correctly, studies have shown 医生开的有色隐形眼镜是安全的,尽管非处方有色隐形眼镜就不一定安全了.
There are various options available, including custom lenses. Those interested should ask their doctor.
如果一个散光的人为了佩戴“正常”颜色的隐形眼镜而选择放弃视觉清晰度, it is important to make sure the contacts are FDA approved and prescribed by a doctor. Even fantasy contact lenses meant for cosplay can be prescribed by a doctor.
What to Do When Astigmatism Contacts are Uncomfortable
散光的隐形眼镜,尤其是环形隐形眼镜,更难以正确配合. It takes more expertise from an eye doctor to correctly align the contact, 佩戴者也可能需要练习才能适应放置它们.
Toric contacts are usually weighted. When blinking and engaging in daily activity, toric contacts will naturally rotate. 镜头体积较大的部分是为了确保它自动旋转回原位.
2013年进行的一项研究表明,大约80%的新环面隐形眼镜佩戴者在第一次尝试后能够成功舒适地佩戴镜片.
If someone is struggling with their contact lenses, they should contact their eye doctor immediately. There are various options and brands available. 一个好的眼科医生会确保病人的舒适度和视力都得到适当的考虑.
Can People with Astigmatism Wear Contact Lenses?
散光患者是否可以戴隐形眼镜的问题不再经常出现. It is generally well-known that there are options, with the most popular being rigid gas permeable lenses, toric contacts, and hybrid contacts.
While hybrid contacts are thought to be the most comfortable with the sharpest vision, they also offer the steepest price tag.
对于那些有严重散光的人来说,戴隐形眼镜是必须的. These soft lenses are designed specifically for people with astigmatisms, 体积更大,更薄的部分,旨在创造稳定的位置,始终旋转回到对齐.
Finally, 坚硬的透气性镜片提供了锐利的视觉敏锐度,但眼睛需要更多的时间来适应其坚硬的边缘. A set of RGPs can last up to an entire year, though, making their higher price tag more economical than they appear.
Astigmatism is inherited but can also worsen. 大多数人都有某种形式的散光——角膜圆顶的完美曲线很容易被年龄打断, injury, or surgery.
For some, 散光会很低,以至于普通隐形眼镜(或普通隐形眼镜的强力处方)也能提供清晰的视力.
However, for most people with astigmatism, 为矫正散光而设计的眼镜或隐形眼镜将改善视力和整体生活质量.
If someone is experiencing blurry vision and distorted image, especially when accompanied by headaches, an eye doctor should be seen as soon as possible.
一个人是决定戴眼镜还是找到最适合自己的隐形眼镜, astigmatisms are incredibly common and fairly simple to correct.
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