IntraOcular Lens (IOL)

 What Is Intraocular Lenses?

An intraocular lens (or IOL) is a tiny, artificial lens for the eye. It replaces the eye's natural lens that is removed during cataract surgery.

The lens bends (refracts) light rays that enter the eye, helping you to see. Your lens should be clear. But if you have a cataract, your lens has become cloudy. Things look blurry, hazy or less colorful with a cataract. Cataract surgery removes this cloudy lens and replaces it with a clear IOL to improve your vision.

IOLs come in different focusing powers, just like prescription eyeglasses or contact lenses. Your optometrist will measure the length of your eye and the curve of your cornea. These measurements are used to set your IOLs focusing power.

What are IOLs made of?

Most IOLs are made of silicone, acrylic, or other plastic compositions. They are also coated with a special material to help protect your eyes from the sun's harmful ultraviolet (UV) rays

Types

Monofocal :- Monofocal intraocular lenses are indicated for the visual correction of aphakia after extracapsular cataract extraction. Such lenses have a single focus and are usually planned to correct the distance vision. Patients having such lenses need glasses for near.                                                               These IOL are category according to the companies too like O-Care Group (Indian), Zeiss, Alcon, Aurolab etc.
These are of various types which are as follows: 

Hydrophilic:-

 a) The lens design ensures smooth insertion and proper positioning inside the eye. 

 b) The 360 degrees Square Edge reduces the incidence of PCO (POSTERIORCAPSULAR OPACIFICATION THE SECONDARY CATARACT). 

c) Biconvex Aspheric Optic Ensures that the lens is virtually. 

d) Better visual acuity and Enhance Contrast

2.   Hydrophobic:-                                                 

a) The lens design ensures smooth insertion and proper positioning inside the eye.                         b) Square Edge reduces the incidence of PCO.                                                                

 c) Aspheric Optic.                                                                                                                   

d) Reduces the incidence of vacuole formation.                                                                         

 e) The material has a Refractive Index of 1.53 which is optimal to prevent reflectivity                   

f) Proprietary Hydrophobic material eliminates Glistening effect

It has been observed that patients with hydrophilic IOLs are at higher risk of developing calcification and POC. Hydrophobic IOLs are much better than Hydrophilic IOLs. Where the recommend to reduced use of Hydrophilic IOLs and recommend hydrophobic ones over them.

Monofocal Toric:- The Monofocal Toric Lens Implant is designed to help patients with astigmatism achieve their best possible distance vision following cataract surgery, with minimal need for distance eyeglass correction and near eye correction.

Multifocal:- As the name implies, a multifocal IOL offers more than one lens power. The technology functions very much the same as bifocal eyeglasses and multifocal contact lenses. The difference is that the lens is surgically implanted in the eye and offers a permanent, maintenance-free solution to presbyopia.

Advantages:-

a) Reduced lifetime cost of glasses and contacts. Multifocal IOLs can decrease your need for reading glasses or computer glasses after cataract surgery. 

• b) More freedom to live actively and unencumbered.

c) No upkeep or routine replacement necessary

Disadvantages:-

For example, there is some loss of clarity and contrast with multifocal lenses, which can present a problem with night vision. Some patients also experience a glare or halo. In addition, you won't achieve 20/20 vision with multifocal lenses and may require additional vision correction solutions.

Multifocal Toric:- Multifocal / toric lens implants are a hybrid of multifocal and toric lens implants. They're the first type of IOL to correct astigmatism along with multiple other vision problems at one time.

Edof:- Extended depth-of-focus (EDOF) is a new intraocular lens (IOL) technology in the treatment of presbyopia. In contrast to multifocal (MF) IOLs, EDOF lenses create a single elongated focal point, rather than several foci, to enhance depth of focus.

Disadvantages:-

A potential disadvantage of this is a blur due to decreased retinal image quality when the amount of the aberrations is increased excessively.

Advantages:-

 EDOF lenses aim to reduce photic phenomena, glare, and halos, which have been reported in Multifocal IOLs. 

Edof Toric:- Extended Depth of Focus and Toric intraocular lenses (EDOF) or Extended Range of Vision (EDF) is an advanced technology used primarily to treat cataracts and presbyopia. These newer IOLs incorporate an innovative diffractive design and achromatic technology that makes the lens different from multifocal IOLs.

Disadvantages:-

Potential for needing glasses still: While toric lenses target distance vision, you might still need glasses for reading or other close-up activities. Risk of rotation: In rare cases, the toric lens might rotate within the eye, causing blurred vision. This can usually be corrected with a minor procedure.

1. Trifocal 
2. Trifocal Toric

   
   

1. TRIFOCAL

 A trifocal IOL is a type of artificial lens used in cataract surgery to replace the natural lens of the eye. Which provides clear vision at distance, intermediate, and near, potentially reducing or eliminating the need for glasses or contacts.

 

        Multiple focal points:

• Trifocal IOLs are designed to provide clear vision at three different distances. 
• Improved vision quality:
• These lenses can improve vision for activities requiring near, intermediate, and far vision.
• Potential for glasses independence:
• Trifocal IOLs may allow individuals to be less reliant on glasses or contacts. 
• Advanced technology:
• They represent a more advanced type of IOL compared to traditional Monofocal lenses.
• Cataract surgery:
• Trifocal IOLs are typically implanted during cataract surgery, a procedure to remove a cloudy natural lens and replace it with an artificial lens.
• In simpler terms: Imagine a regular lens that only focuses on far objects. A trifocal lens is like a lens with three built-in focusing powers, allowing you to see clearly at near, intermediate, and far distances. This means you can see clearly when reading, working on a computer, and looking at objects in the distance. 

What Is Monofocal iols: - Monofocal iols are the iols which only correct the distance vision these are of various types.

Normal	Premium
Ocuflex (Indian)	Zeiss(Germany)	Alcon(American)
Hydrophilic	Hydrophobic	Hydrophobic
Non Ionic Nature	Yellow Tint	Yellow Tint
PCO High Level	Heparin Coated (Less PCO)	Low PCO
BiConvex	Blue Light Filter	Highly UV & Blue Light Filter
Spherical	Aspheric (aberration correcting)	Good Stability
Refractive index 1.465	PRE Loaded	Excellent Vision
	Refractive index  1.49	Pre-Loaded
		Refractive index  1.55
		Aspheric asymmetric biconvex

What is Toric Monofocal Iols: - Toric Monofocal are the iols which correct the distance vision with astigmatism these are of various types

Normal	Premium
Acriol EC Toric(Indian)	Zeiss Toric(Germany) NPR	Alcon Toric(American)
Hydrophobic	Hydrophobic	Hydrophobic
Yellow Tint	Yellow Tint	Yellow Tint
PCO Low	Heparin Coated (Less PCO)	Low PCO
Biconvex	Blue Light Filter	Highly UV & Blue Light Filter
Aspheric	Aspheric (aberration correcting)	Good Stability
Refractive index 1.53	PRE Loaded	Excellent Vision
UV light blocker	Refractive index  1.49	Pre-Loaded
		Refractive index  1.55
		Aspheric asymmetric biconvex

 

 

What Is Edof iols :-Edof iols are the iols which corrected the distance, intermediate and little bit near vision these are of various types

Normal	Premium
Magnificent(Indian)	Zeiss Edof(Germany)	Alcon VIvity (American)
Hydrophobic	Hydrophobic	Hydrophobic
Yellow Tint	Yellow Tint	Yellow Tint
PCO Low	Heparin Coated (Less PCO)	Low PCO
Biconvex	Blue Light Filter	Highly UV & Blue Light Filter
Aspheric	Aspheric (aberration correcting)	Good Stability
Refractive index 1.53	PRE Loaded	Excellent Vision
Distance + Intermediate + Near (40cm)	Refractive index  1.46	Pre-Loaded
Wide range of focus	Wide range of focus	Refractive index  1.55
Pre-Loaded	Distance + Intermediate + Near (40cm)	Aspheric asymmetric biconvex
UV light blocker	Pre-Loaded	Distance + Intermediate + Near (40cm)
		Wide range of focus

 

What Is Edof toric iols: - Edof iols are the iols which corrected the astigmatism of distance, intermediate and little bit near vision these are of various types

Normal	Premium
Magnificent Toric(Indian)	Zeiss Edof Toric(Germany)	Alcon VIvity Toric(American)
Hydrophobic	Hydrophobic	Hydrophobic
Yellow Tint	Yellow Tint	Yellow Tint
PCO Low	Heparin Coated (Less PCO)	Low PCO
BiConvex	Blue Light Filter	Highly UV & Blue Light Filter
Aspheric	Aspheric (aberration correcting)	Good Stability
Refractive index 1.53	PRE Loaded	Excellent Vision
Distance + Intermediate + Near (40cm)	Refractive index  1.46	Pre-Loaded
Wide range of focus	Wide range of focus	Refractive index  1.55
Pre-Loaded	Distance + Intermediate + Near (40cm)	Aspheric asymmetric biconvex
UV light blocker	Pre-Loaded	Distance + Intermediate + Near (40cm)
		Wide range of focus

 

 

What Is Trifocal iols: - Trifocal iols are the iols which corrected the distance, intermediate and near vision clearly these are of various types

Normal	Premium
Triphobic hd(Indian)	Zeiss Trifocal(Germany)	Alcon Panoptix (American)
Hydrophobic	Hydrophobic	Hydrophobic
Yellow Tint	Yellow Tint	Yellow Tint
PCO Low	Heparin Coated (Less PCO)	Low PCO
BiConvex	Blue Light Filter	Highly UV & Blue Light Filter
Aspheric	Aspheric (aberration correcting)	Good Stability
Refractive index 1.543	PRE Loaded	Excellent Vision
Pre-Loaded	Refractive index  1.49	Pre-Loaded
Wide range of focus	Wide range of focus	Refractive index  1.55
Distance + Intermediate + Near (40cm)	Distance + Intermediate + Near (40cm)	Aspheric asymmetric biconvex
UV light blocker	Pre-Loaded	Distance + Intermediate + Near (40cm)
No Spectacle Dependency	No Spectacle Dependency	Wide range of focus
Slanted Transition zones of decreasing Height which Reduces Light Scattering &  halos	Less Light Scattering &  halos	No Spectacle Dependency   Low Light Scattering &  halos

What Is Toric Trifocal iols: - Trifocal iols are the iols which corrected the astigmatism distance, intermediate and near vision clearly these are of various types

Normal	Premium
Triphobic hd Toric(Indian)	Zeiss Trifocal Toric(Germany)	Alcon Panoptix Toric(American)
Hydrophobic	Hydrophobic	Hydrophobic
Yellow Tint	Yellow Tint	Yellow Tint
PCO Low	Heparin Coated (Less PCO)	Low PCO
BiConvex	Blue Light Filter	Highly UV & Blue Light Filter
Aspheric	Aspheric (aberration correcting)	Good Stability
Refractive index 1.543	PRE Loaded	Excellent Vision
Pre-Loaded	Refractive index  1.49	Pre-Loaded
Wide range of focus	Wide range of focus	Refractive index  1.55
Distance + Intermediate + Near (40cm)	Distance + Intermediate + Near (40cm)	Aspheric asymmetric biconvex
UV light blocker	Pre-Loaded	Distance + Intermediate + Near (40cm)
No Spectacle Dependency	No Spectacle Dependency	Wide range of focus
Slanted Transition zones of decreasing Height which Reduces Light Scattering &  halos	Less Light Scattering &  halos	No Spectacle Dependency   Low Light Scattering &  halos

 

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