Fourier Optic IOL
ALSAFIT 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
ALSAFIT 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. Alsafit Fourier is the only IOL that continues to perfom high MTF values at all distances.
Alsanza aspheric IOLs designed to control corneal positive spherical aberrations with its mild spherical aberration correction. 24H aspherical correction leaves weak spherical with longitudinal focus as young adaptive eye behaves.
Provides continuous contrast sensitivity in low light conditions as well as photopic conditions.
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
IPN (Interpenetreting Polymer Network) technology builds Ultra Pure Monomers with undestroyable connections in 3 Dimentional structure. This creats a strength polymer network protecting IOL from deformation, delamination or dispersion.
1- Both Elastic & Strengthened IOL material ; 2 different chemical identities simultaneously provide best features of two. Smart Matrix has Strength of Hydrophobicity and Elastic of Hydrophilicity at the same time Both optimized Strength and Elastic properties allows surgeon confidently perfom MICs.
2- 3D Integrated Hdyrophobic surface Surface of Smart Martix material shows hydrophobic behaviour on surface, unlike the composite behaviour of inner structure. Beneficial for;
- Increased fibronectin bioadhesion
- Low affinity to LECs
- Reduced risk of PCO
Ultra Pure monomers and Zero polymerization technology; Lowers the residual methacrylic acid monomer content and results in zero iconicity polymer which is 10 to 20X less acid than other ‘highest purity’ commercial monomers.
Zero ionicity Smart matrix material provides further degree of quality by eliminating the possibility of calcium phosphate particles formations over time. And increases strength and biocompatiblity of ALsanza IOLs
Supports High optic Perfomance In Point Spread Function Test (PSFT). Pure material keeps IOL durable and prevent microwrinklings on optic zone after folding and unfolding.
Smart Matrix exhibits %33 lower surface roughness than competitors thanks to it’s ultra pure monomer polymerization procedures. That reduces matrix size and surface roughness of material
- Reduced LEC Migration and adhesion to lens optic surface
- Reduced PCO incidence
The amount of surface irregularities is linearly related to the number of inflammatory cells adhering to the optic surface of the IOL and to the rate of LEC migration and PCO incidence
Fıns4FIT Haptic design allows physician easy folding with 0˚ haptic body angle. 30° of Suspensive corner Fins ensures lens to fit in various
2 Wide OVD Aspiration Holes; facilitate final aspirations in surgery
4 Positioning Holes; supports more accurate lens positioning
4 Suspensive Corner Fins demonstrate suspensive movements against compression stresses.
Show high tendency to preserve IOL position and refractive stability with reducing risks of tiltations caused eventual crystalline bag contractions.
Harmonically stable and adaptive
Fins4FIT haptic design enhances ALSAFIT IOLs with self-adaptive feature of corner fins. Corner Fins able to stabilize all IOL either in Small or Larg Capsular bag sizes by easy self-adaptation sizes of crystalline bag by self-adaptation.
High Dioptric Accuracy
Alsanza Optic Intellegence standardize more sensitive dioptric deviation control than international standardizes. Manufacturing process ensures to perform High Dioptric Accuracy in total range of IOLs with 0.25D a very low dioptric deviation value comparatively
MTF Value: 0,60 at 100 lpm
With 0,60 at 100 lpm, ALSANZA IOLs presents one of highest MTF value in competiton Optic quality of ALSANZA IOLs present well above International standards. Permitted MTF value is established as only 0,43 at 100 lpm for global IOL manufacturers ALSANZA executes strict control mechanism to maintain high standards by individually checking MTF values of each product in line.
HIGHEST ABBE NUMBER
All Alsanza IOLs offer strong Chromatic Aberation Control with Abbe Number: 58,highest in market. Chromatic aberration depends on refractive indices of lens. High chromatic aberrations produce a blurred image with coloured fringes
Prevention of posterior capsular opacification is an important component of global patient satisfaction and desired continuous Optic Quality
All ALSANZA IOLs have most prominent edges with Diamond Cut Edge design that frames all optical field. More sharpened design of Diamond Cut Edge most effectively blocks LEC migration than conventional square edge & Non-edged designes.
ALSIOL VF is effective for UV and Violet spectrum photoprotection avoiding total blue blocking. Contains photoselective chomophore 3- hydroxykyurenine that naturally founds in crystalline lens. Protects retina from UV and Violet light with allowing %95 of blue light transmission at 480 nm wavelength
- Protects retina without blocking essential blue light in order to facilitatecircadian system
- Optimal concentration of exact crystalline chromophore provides clearer contrast sensitivity and color perception contrary to ‘synthetic yellow filters’ does.
Offers Sufficient Photoprotection without Deficient Phototransmission
- For better scotopic vision with blue photoreception
Why Blue Light Transmission is important ?
Blue light has an important role in the circadian system, affecting the sleep–wake cycle, mood and cognition. Circadian system primarily depends on photopigment regulation of melanopsin. Melanopsin has a peak absorption at 460-480 nm