Analysis on multifocal contact lens design based on optical power distribution with NURBS

Purpose. To compare the results of trifocal IOL calculation using various corneal tomographic data (ring and zone). Methods. This retrospective study involved 46 patients (46 eyes), underwent cataract surgery with trifocal IOL implantation (AcrySof IQ PanOptix). The calculation was performed using Tomey OA-2000 according to 2 formulas (Barrett II Universal, Olsen). Keratometry values included Km (the average of two main meridians of a cornea) provided by Pentacam HR Power Distribution Apex map, which describes total corneal refractive power (TCRP) with diameter of 3.0, 4.0 and 5.0 mm on a ring and zone. Mean (MAE) and median (MedAE) predicted postoperative refraction errors were assessed after surgery. Results. Mean Km value on 3 mm zone and ring was: 42.75±1,46 D and 42,91±1,43 D, respectively (p<0,0001). Mean Km on 4 mm zone and ring was: 42.6±1.5 D and 43.3 ± 1.5 D, respectively (p <0.005). Mean Km value on 5 mm zone and ring was: 43,09±1,5 D and 43,55±1,48 D, respectively (p<0,0001). Calculations using the Barrett II Universal formula revealed significant difference between MAE and MedAE of the predicted postoperative refraction on 5mm zone and ring (p=0.045). When using the Olsen formula in the calculations, significant difference was revealed using the Km data with a diameter of 3 mm and 5 mm (p=0.001 и p=0.009, respectively). The calculation on 3 mm ring was more accurate than for 3 mm zone. With a 5 mm diameter, the calculation is more accurate according to the zone data. Conclusion. Mean Km value on Power Distribution Apex map according to ring is significantly greater then according to zone. 1) The calculation of the trifocal IOL based on the TCRP zone data is reliably more accurate than the ring data according to both formulas (Barrett II Universal and Olsen) with a diameter of 5 mm. 2) According to the Olsen formula with a diameter of 3 mm, the calculation of the optical power of trifocal IOL based on TCRP ring data is more accurate. Key words: IOL calculation, Trifocal IOL, corneal topography

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Influence of depth of intermediate layer on optical power distribution in W-type optical fibers

Applied Optics ◽

10.1364/ao.51.004896 ◽

2012 ◽

Vol 51 (20) ◽

pp. 4896 ◽

Cited By ~ 10

Author(s):

Ana Simović ◽

Alexandar Djordjevich ◽

Svetislav Savović

Keyword(s):

Optical Fibers ◽

Power Distribution ◽

Intermediate Layer ◽

Optical Power

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STUDY OF THE OPTICAL POWER OF NANOPHOTONIC SOFT CONTACT LENSES BASED ON POLY (2- HYDROXYETHYL METHACRYLATE) AND FULLERENE

Contemporary Materials ◽

10.7251/comen1401151m ◽

2014 ◽

Vol 5 (1) ◽

Author(s):

Aleksandra Debeljković Mitrović ◽

Dragomir Stamenković ◽

Manuel Conte ◽

Božica Bojović ◽

Spomenko Mihajlović

Keyword(s):

Contact Lens ◽

Contact Lenses ◽

Measurement Techniques ◽

Optical Power ◽

Soft Contact ◽

Standard Material ◽

Soft Contact Lenses ◽

Soft Contact Lens ◽

Power Cylinder

In this paper results of comparative study of the optical power of soft contact lenses (SCL) made of standard material for SCL and nanophotonic materials with different measurement techniques used for the final contact lens controllers are presented. Three types of nanophotonic soft contact lenses were made of standard polymacon material (Soleko SP38TM) incorporated with fullerene C60, fullerol C60(OH)24 and fullerene metformin hydroxylate C60(OH)12(OC4N5H10)12. For the purposes of material characterization for potential application as soft contact lenses, the optical properties of the soft contact lenses were measured by Rotlex and Nidek device. With Rotlex device the following optical results were obtained: optical power and map of defects, while with the Nidek device: optical power, cylinder power and cylinder axis. The obtained values of optical power and map of defects showed that the optical power of synthesized nanophotonic soft contact lens is same to the nominal value, while this was not the case for the standard soft contact lens. Also, the quality of the nanophotonic soft contact lens is better than the standard one. Hence, it is possible to synthesize new nanophotonic soft contact lenses of desired optical characteristics, implying possibilities for their application in this field.

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Compensating additional optical power in the central zone of a multifocal contact lens forminimization of the shrinkage error of the shell mold in the injection molding process

Applied Optics ◽

10.1364/ao.57.002981 ◽

2018 ◽

Vol 57 (12) ◽

pp. 2981 ◽

Cited By ~ 1

Author(s):

Lien T. Vu ◽

Chao-Chang A. Chen ◽

Chia-Cheng Lee ◽

Chia-Wei Yu

Keyword(s):

Injection Molding ◽

Contact Lens ◽

Central Zone ◽

Optical Power ◽

Injection Molding Process ◽

Shell Mold ◽

Molding Process

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Effects of different contact lens design on reading beahviour of pre presbyopic subjects subjects

Contact Lens and Anterior Eye ◽

10.1016/j.clae.2019.10.047 ◽

2019 ◽

Vol 42 (6) ◽

pp. e14

Author(s):

Giancarlo Montani ◽

Ruggiero Lavermicocca

Keyword(s):

Contact Lens ◽

Lens Design

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Coupling. Non-Symmetric Behaviour of a Joint Between Multimode Fibers

Journal of Optical Communications ◽

10.1515/joc-1984-0303 ◽

1984 ◽

Vol 5 (3) ◽

Author(s):

G. Cancellieri ◽

U. Ravaioli

Keyword(s):

Power Distribution ◽

Dispersion Compensation ◽

Coupling Efficiency ◽

Optical Power ◽

Optical Source ◽

Multimode Fibers ◽

Intermodal Dispersion ◽

Intentional Mode ◽

Different Characteristics ◽

Mode Mixing

SummaryWhen two different multimode fibers are jointed together, mode mixing and mode filtering take place, with different characteristics in the two directions, leading to a non-symmetric behaviour. A detailed analysis of the power transitions among the guided modes at the joint is presented here. Explicit formulas for coupling efficiency and intermodal dispersion compensation are derived. The intentional mode mixing which is produced by suitable beam-launchers, in order to reach an optical power distribution independent of that of the optical source, is also investigated.

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Design of a Four-Branch Optical Power Splitter Based on Gallium-Nitride Using Rectangular Waveguide Coupling for Telecommunication Links

Journal of Engineering ◽

10.1155/2019/7285305 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9

Author(s):

Retno W. Purnamaningsih ◽

Nji R. Poespawati ◽

Elhadj Dogheche

Keyword(s):

Gallium Nitride ◽

Power Distribution ◽

Optical Power ◽

Power Input ◽

Input Power ◽

Propagation Length ◽

Power Splitter ◽

Excess Loss ◽

Total Input ◽

Rectangular Waveguides

This paper reports design of a simple four-branch optical power splitter using five parallel rectangular waveguides coupling in a gallium-nitride (GaN) semiconductor/sapphire for telecommunication links. The optimisation was conducted using the 3D FD-BPM method for long wavelength optical communication. The result shows that, at propagation length of 925 μm, the optical power input was successfully split into four uniform output beams, each with 24% of total input power. It is also shown that the relative output power distribution is almost stable through the C-band range. At the operating wavelength of 1.55 μm, the proposed power splitter has an excess loss lower than 0.2 dB. This study demonstrates the opportunity to develop optical interconnections from UV-Visible to near IR wavelengths.

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