Description

Why Aspheric Correction is so crucial?

When parallel rays pass through the spherical surface, the central rays focus on more posteriorly and peripheral rays focus more anterior progressively. In the IOLs without aspherical correction, peripheral rays are bent too much .Specially at dim night conditions, Spherical aberrations increase as a result of expanded puppil size due to  defocusing of improper refracted light.

Total spherical aberrations will result;

• Astigmatism-like aberration
• Light scatterings in mesopic conditions

Fourier Optic IOL

ALSASET  FOURIER is a total presbyopia correcting IOL for cataract and RLE surgery procedures. By carrying a disruptive innovation in optical design, Fourier Optic is fitted out with reverse apodization in all optical zone (6mm) .  This unique pattern is developed by transforming classical edged overlapping Fresnel diffraction into Fourier Optic with reverse apodization. Throughout reverse apodized Fourier Optic , it contists  of 14 soft transition steps which support possessing high quality of vision at all distances  regardless of lighting condition.

What is Reverse Apodization?

Reverse Apodization determines the increase in hight of the Fourier Optic diffraction lays trough central to peripheral. Height of the steps determine the quantity of energy transferred between near, intermediate and far vision. The higher the steps, the more energy  delivery to near vision.

Why Reverse Apodization?

Reverse Apodization maintains continuity of balanced light  distribution and continuous focus regardless of lighting conditions. Patent pending Fourier Optic with Reverse apodization  features  24H Balanced Light Distribution that enables high energy distribution to near and intermediate in mesopic conditions as well as photopic. That unique design promises patients more efficent light distribution and  have clear vision at all distances during daytime and nighttime.

Maximized Light Transmission

ALSASET FOURIER provides %91,4 Light Transmission thanks to patent pending Reverse Apodized Fourier Optic . Fourier Optic diffraction on optical area transmit large part of the light to retina by reducing reflected and scattered light. Classical sharp edged and overlapping diffractive IOLs exhibit important light loss(12 to 15 %) which has direct impact on visual performance.

24Hours Balanced Light Distribution

Increasing height of the  Fourier Optic diffraction from central to peripheral on optical area provides high energy delivery  to near and intermediate with the enlarging of the pupil. With 24H Balanced Light Distribution Fourier Optic IOL offers high contrast sensitivity at near, intermediate and far vision and all distances in between during daytime and nighttime

Preserving near light distributionin in conjunction with increased far light distribution facilitates a spectacle free vision and contrast sensitivity also in mesopic conditions.

Continuous Focus with Fourier Optic IOL

Profile of diffractivity has an important role in modulation result of IOLs. In comperison Fourier Optic IOL continuous to perform high MTF values at all distances . Preciously designed undulatory pattern with reverse apodization differs from other trifocal IOLs. Alsaset Fourier is the only IOL that  continues to perfom high  MTF values at all distances.

ALSASET FOURIER
TOTAL PRESBYOPIA CORRECTING IOL	Biconvex
Haptic Design	FINS4FIT
Optic Ø	6.00 mm Bi- Aspheric
Overall Ø	11.00 mm
Additions:	Intermediate: +1.77D Near : +3.55D
Reading Distances:	Intermediate : 70 cm Near : 35cm
Light Transmission:	% 91.4
Material	Smart Matrix ; Interpenetrating Polymer Network of Hydrophobic &Hydrophilic Acrylic
Surface Character	3D Integrated Hydrophobic Surface
Optic Features	Spherical Aberration Correction : mild, -0.09µm
Edge Design	Diamond Cut Edge
Haptic Angle	0˚
Suspensive Corner Fins Angle	30˚
Refractive Index Wet	1.462/1.462 ± 0.002 @546 nm (20C° / 35C°)
Diopter Power Range	From 0.0D to + 32.50D ( 0.50 increments)
Light Filtration	Violet Filter , UV
Injection System	ALSAJET glide 1.8 (Up to +25D)
	2.0 (Up to +28D)
	ALSAJET glide 2.2 (Up to +30D)