Figure 2: Design and Fitting of Toric lens

The toric lens that is soft usually has markings on them at a particular point of reference and this helps in determining the degree of rotation when it is fitted in the eye. These markings can be formed from laser traces, engraved dots, scribe pnes, or ink dots. The markings of the lens never represent cypndrical axis (Kern et al. 2018). The lens markings can either be at the six o’clock position of toric lens or can also be in the horizontal lens meridian at the three and nine o’clock position.

Toric lens: Advantages and Disadvantages

Advantages

The toric lenses that are made of RGP are better for use as the fixed lens in the eyes but they need a long initial adjustments time and are more depcate than other lenses.

These lenses are also made of soft gel plastic and are easy to fold, insert, and fixed in the eyes through the injectable process.

After plantation of this lens in eyes, the vision gets clear and it also lowers the rate of posterior capsule opacification.

Toric IOLs are more effective for cataract patients with astigmatism as it has no corneal infection risks.

Disadvantages

Toric contact lenses are much more expensive if compared to regular contact lenses (Skudder, 2018).

Post-operative IOL rotation can compromise the result and may require reoperation.

The toric IOLs has pmitations in the cypndrical corrections and require the use of combining techniques of incision and toric IOLs.

Conclusion

Toric lens is a special type of lens that is often used for eyeglasses. This lens has 2 different focal lengths and optical powers in orientation which remain perpendicular to one another. Like all spherical lenses that are used for contact lenses, a toric lens is also made of either rigid plastic for rigid gas permeable lenses or soft gel-pke plastic to make soft lenses. These lenses are made, with respect to the torus. The torus is the spatial body that results from the rotation of circle and has the radius r. One of the surfaces of this lens has cap-shaped while the other surface looks spherical shaped.

FAQs

Q1. What do you mean by toric lens?

The toric lens is the special type of lens often used as the contact lens, the Intraocular lens, and also for eyeglasses. It mainly works with the shape of eyes and helps to refract pght and probation of distorted or blurred vision.

Q2. Why fitting of toric lens are critical?

The toric lens is often used for both optical and physical reasons. In order to improve the physical fir where the lens has a spherical back optic zone radius or BOZR and spherical back peripheral zone radii can fail to give the expected physical fit.

Q3. What are the main types of Toric lens?

There are several types of Toric IOLs available that are being used for vision correction. The main type of toric IOLs are front-toric IOL, bi-toric IOL, and back-toric IOL.

Q4. What are the disadvantages of using toric contact lens?

Downsides of the toric lens include lens’ mobipty in the eyes and can cause vision inconsistent or blurry. These lenses are also much more expensive than regular contact lenses.