Disadvantages ofaspheric lenses

Avaira Vitality™ lenses are highly breathable, bi-weekly replacement lenses designed with the same Aberration Neutralizing System™ as the Biofinity® family. The technology of a Avaira Vitality™ retains the lens surface moist all day, but also blocks transmission of 90% of UVA and 99% of UVB light*.

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* Warning: UV-absorbing contact lenses are not substitutes for protective UV-absorbing eyewear, such as UV-absorbing goggles or sunglasses, because they do not completely cover the eye and surrounding area. Patients should continue to use UV-absorbing eyewear as directed.

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Figure 1: The input beam has a smaller waist diameter than the output beam. However, the diameter of the smaller input beam changes at a substantially higher rate than the larger output beam. Within the limited range shown above, the diameter of the input beam exceeds that of the output beam.

Lens design and the patient’s pupil size are key to multifocal success. The Biofinity Multifocal has a center-distance (D) lens, which transitions through an aspheric intermediate to an outer near zone for the dominant eye. A center-near (N) lens which transitions through an aspheric intermediate to a spherical peripheral distance zone, is placed on the nondominant eye7. When compared with monovision, multifocal contact lens correction provides great vision without compromising depth perception, with continuous adaptation over the first 15 days of wear8.

by RV Olarte · 2011 · Cited by 43 — Para entender el valor que las aberraciones tie- nen a nivel ocular, es importante visualizar el ojo humano como un sistema aberrado que produce imágenes en la ...

6. Patel, N, Edmonson, L, Edmonson, W. Masking Cylinder with Aspheric Soft Lenses. Contact Lens Spectrum. Published 1, July 2004. Retrieved July 28, 2022 from https://www.clspectrum.com/issues/2004/july-2004/masking-cylinder-with-aspheric-soft-lenses

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1. Kollbaum PS, Bradley A, Thibos LN. Comparing the optical properties of soft contact lenses on and off the eye. Optom Vis Sci. 2013 Sep;90(9):924-36. doi: 10.1097/01.opx.0000434275.93435.da. PMID: 23969894; PMCID: PMC3902057.

3. Richdale, K, Cox, I, Kollbaum, P, et al.BCLA CLEAR – Contact lens optics. Contact Lens and Anterior Eye. Volume 44, Issue 2, 2021, Pages 220-239,ISSN 1367-0484,https://doi.org/10.1016/j.clae.2021.02.005

4. Mrochen M, Büeler M. Asphärische optiken: physikalische grundlagen [Aspheric optics: physical fundamentals]. Ophthalmologe. 2008 Mar;105(3):224-33. German. doi: 10.1007/s00347-008-1717-z. PMID: 18309494.

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can be calculated from the wavelength () and beam waist diameter, or from two measurements of the beam diameter (D1 and D2 ) separated by a known distance (Δz ). The two beam diameter measurements should be made far from the beam waist, well outside of the Rayleigh range.

The Biofinity® family of lenses are monthly replacement lenses designed with aspheric optics and combined with Aquaform® Technology to gives incredible end of day comfort for your patients. Biofinity® is the most prescribed monthly replacement on the market10 and will fit almost every patient with over 240,000 unique prescriptions11,12.

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The difference in the angular divergence of the beams input to and output from a beam expander or reducer can be estimated using the beam expansion ratio (m ). While a beam expander changes the waist diameter by a factor of m, the divergence angle far from the beam waist is scaled by a factor equal to 1/m,

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Since a beam expander converts an input beam with a smaller waist and larger divergence into an output beam with a larger waist and smaller divergence, the output beam can have a smaller diameter far from the beam expander when compared with the input beam. The beam diameter does not remain constant with distance due to the effects of diffraction. As the beam divergence is higher for beams with smaller waists, using a beam expander to increase the waist diameter is a technique for reducing the rate at which the beam diameter increases as the beam propagates away from its waist. Beam expanders are often used to reduce beam divergence and ensure the beam diameter does not exceed a specified limit at distances far from the output beam waist.

Aspheric meaning

5. Read SA, Vincent SJ, Collins MJ. The visual and functional impacts of astigmatism and its clinical management. Ophthalmic Physiol Opt. 2014 May;34(3):267-94. doi: 10.1111/opo.12128. Epub 2014 Mar 18. PMID: 24635572.

The CooperVision® portfolio of monthly, bi-weekly, and daily lenses are designed with aspheric optics. The Aberration Neutralizing System™ utilizes aspheric optics to neutralize the aberrations from the eye in the Biofinity®, Avaira Vitality™ and MyDay® families. clariti® 1 day contact lenses also offer an aspheric optical design.

A beam reducer (m < 1) provides an output beam with a smaller waist diameter (Wo' < mWo ) and a larger divergence angle (θout > θin / m ) than the input beam. As a result, the output beam diameter will be smaller close to the output of the beam reducer, but as the light propagates away, the beam size will increase at a faster rate than the input beam. When using a beam reducer, it is critical to check the output beam diameter along the optical axis to ensure the beam does not exceed the application's maximum acceptable beam size.

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13. Based on manufacturers published data. clariti 1 day has Dk/t of 86. Compared to Proclear 1 day (Dk/t 28), 1-day Acuvue Moist (Dk/t 25.5), Dailies Aquacomfort Plus (Dk/t 26) and Biotrue ONEday (Dk/t 42).

Many differences exist between brands of contact lenses which impact lens optics. The optics of the contact lens is determined by several factors including lens material1 and design2. Optics is the way in which the refraction of light is managed to maximize vision for the contact lens wearer3. Contact lenses with aspheric optics may provide enhanced vision for many wearers.

7. Bennett, Edward. Bifocal and Multifocal Contact Lenses. Contact Lenses (2019). Retrieved 29 July, 2022 from https://www.sciencedirect.com/science/article/pii/B9780702071683000131

‡ With higher oxygen delivery than hydrogel materials, SiHy materials minimize or eliminate hypoxia-related complications during daily wear.

Contact lenses with aspherical optics can be extremely beneficial for subsets of your patients. By recommending a CooperVision® lens, you can be confident you are offering options in support of visual acuity, lens comfort, and eye health ‡.

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In the case of a beam expander (m > 1), the output beam waist diameter is larger (Wo' > mWo ) and the output divergence angle is smaller (θout < θin / m ) than the input beam. Due to the output beam's reduced divergence angle, beam expanders are often used to enable free-space beams to propagate over longer distances without exceeding the maximum beam diameter specified by the application.

9. Kajita M, Muraoka T, Orsborn G. Changes in accommodative micro-fluctuations after wearing contact lenses of different optical designs. Cont Lens Anterior Eye. 2020 Oct;43(5):493-496. doi: 10.1016/j.clae.2020.03.003. Epub 2020 Mar 19. PMID: 32201056.

8. Fernandes PR, Neves HI, Lopes-Ferreira DP, Jorge JM, González-Meijome JM. Adaptation to multifocal and monovision contact lens correction. Optom Vis Sci. 2013 Mar;90(3):228-35. doi: 10.1097/OPX.0b013e318282951b. PMID: 23376896.

Aspheric lensesadvantages disadvantages

Avoid Beam ClippingThe diameter of the output beam close to the beam expander is often a good approximation of the output beam waist diameter. Farther away, the beam diameter may have increased enough to cause beam clipping or other unintended effects. Calculating estimates of the beam diameter (D ),

Beam DivergenceA laser beam's diameter is always smallest at its waist. Away from the waist, the beam diameter increases due to the effects of diffraction, and this rate of increase is the beam's angular divergence. Far from the beam waist, the divergence angle is approximately constant (Figure 2). An estimate of this divergence angle (θ ) in radians,

Beam Expanders (and Reducers)Beam expanders (and beam reducers) accept a collimated beam with one waist diameter and provide a collimated beam with a different waist diameter. The expansion ratio, or magnification (m ),

Aspherical lens photography

Figure 2: A beam has a nearly constant divergence angle far from the beam waist. As described in the text, this angle (θ ) can be estimated using two measurements (D2 and D1) of beam diameter, taken far from the waist and separated by a known distance (Δz ).

Measuring the beam cross sections at the input and output beam waist locations can provide estimates of the waist diameters. The manufacturer often specifies the output beam waist location, but if it is not known, a measurement of the beam diameter close to the output of the beam expander can be used to approximate the waist diameter.

Regular spherical contact lenses have an even curvature across the entire lens surface; in contrast, aspheric lenses have varying curvatures across the surface changing from lens center to lens edge. Aspheric lenses are used to minimize optical aberrations within the human eye4. Parts of the eye including the tear film, cornea, and crystalline lens can induce aberrations. Contact lenses deliberately induce a level of aberration in the lens that is inversely equal to the amount of natural spherical aberration inherent in the eye to help give clear, crisp and sharp vision3.

MyDay® daily disposable are designed with the same Aberration Neutralizing System™ to provide optimal vision combined with UV blocking* and incredible comfort all day long. The MyDay® daily disposable is available in sphere, toric, and multifocal options.

2. Abass A, Stuart S, Lopes BT, Zhou D, Geraghty B, Wu R, Jones S, Flux I, Stortelder R, Snepvangers A, Leca R, Elsheikh A. Simulated optical performance of soft contact lenses on the eye. PLoS One. 2019 May 14;14(5):e0216484. doi: 10.1371/journal.pone.0216484. PMID: 31086372; PMCID: PMC6516737.

Biofinity Energys® and MyDay Energys® are designed for digital device users. DigitalBoost™ technology is an innovative single vision aspheric lens design that delivers a +0.3D digital boost, which helps reduce eye tiredness associated with digital eye strain. Study data demonstrates that devices users have a smaller change in accommodative micro-fluctuations (AMF) when wearing this DigitalBoost™ technology, suggesting reduced ciliary muscle stress when reading on a smartphone or other devices at a close distance9.

14. CVI data on file, 2022. Verve Online Survey with US ECPs who fit clariti® 1 day or private label version. n=121 (77% strongly agree/agree).

relates the diameters of the beam waists before (2Wo ) and after (2W'o) the beam expander (Figure 1). The device is a beam expander and provides a larger output beam waist when m > 1. When the output beam waist is smaller, the device is a beam reducer and m < 1.

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clariti® 1 day contact lenses also offer aspheric optics and provide silicone hydrogel at a comparable price to some hydrogel lenses13†. In addition, clariti® 1 day contact lenses feature high water content (56%), UVA and UVB blocker*, and a low modulus of 0.5 MPa, comparable with other hydrogel lenses. The clariti family also offers sphere, toric and multifocal options and is an ideal entry-level contact lens for new wearers14.