Spectacle-wearers make up a considerable part of present-day society, so spectacles are one of th... more Spectacle-wearers make up a considerable part of present-day society, so spectacles are one of the most popular optical instruments - very simple instruments since they are in fact single lenses. On the other hand their mode of operation and the demands for imaging quality ...
Third order aberrations of the hybrid (glass-holographic) lenses with spherical and plano-convex ... more Third order aberrations of the hybrid (glass-holographic) lenses with spherical and plano-convex surfaces and pupil in contact are considered. The paper includes some analytical results obtained by computer ray tracing method.
Applications of Digital Image Processing XXXIX, 2016
Intraocular lens (IOL) is an artificial lens implanted into the eye in order to restore correct v... more Intraocular lens (IOL) is an artificial lens implanted into the eye in order to restore correct vision after the removal of natural lens cloudy due to cataract. The IOL prolonged stay in the eyeball causes the creation of different changes on the surface and inside the implant mainly in form of small-size local defects such as vacuoles and calcium deposites. Their presence worsens the imaging properties of the eye mainly due to occurence of scattered light thus deteriorating the vision quality of patients after cataract surgery. It is very difficult to study influence the effects of these changes on image quality in real patients. To avoid these difficulties two other possibilities were chosen: the analysis of the image obtained in an optomechanical eye model with artificially aged IOL as well as numerical calculation of the image characteristics while the eye lens is burdened with adequately modeled defects. In experiments the optomechanical model of an eye consisting of a glass “cornea”, chamber filled with liquid where the IOL under investigation was inserted and a high resulution CCC detector serving as a “retina” was used. The Modulation Transfer Function (MTF) of such “eye” was evaluated on the basis of image of an edge. Experiments show that there is significant connection between ageing defects and decrease in MTF parameters. Numerical part was performed with a computer programme for optical imaging analysis (OpticStudio Professional, Zemax Professional from Radiant Zemax, LLC). On the basis of Atchison eye model with lens burdened with defects Modulation Transfer Functio was calculated. Particular parameters of defects used in a numerical model were based on own measurements. Numerical simulation also show significant connection between ageing defects and decrease of MTF parameters. With this technique the influence of types, density and distribution of local defect in the IOL on the retinal image quality can be evaluated quickly without the need of performing very difficult and even dangereous experiments on real human patients.
Background: The paper presents a case report of an episode of local anesthetic systemic toxicity ... more Background: The paper presents a case report of an episode of local anesthetic systemic toxicity (LAST) with cardiac arrest after continuous femoral nerve blockade in a 74-year-old female patient after elective total knee replacement surgery. Case presentation: A 74-year-old patient burdened with hypertension, osteoarthritis, underwent elective total knee replacement surgery (TKR). After surgery, a continuous femoral nerve blockade was performed and an infusion of a local anesthetics (LA) was started using an elastomeric pump. Five hours after surgery, the patient had an episode of generalized seizures followed by cardiac arrest. After resuscitation, spontaneous circulation was restored and the patient was transferred to the Intensive Care Unit. 20% lipid emulsion was used in the treatment. On day 2 of the ICU stay, the patient was fully cardiovascularly and respiratorily stable without neurological deficits and was discharged to the orthopedic department to continue treatment. Conc...
Cataract is one of the most frequent reasons of blindness all around the world. Its treatment rel... more Cataract is one of the most frequent reasons of blindness all around the world. Its treatment relies on removing the pathologically altered crystalline lens and replacing it with an artificial intraocular lens (IOL). There exists plenty of types of such implants, which differ in the optical materials and designs (shapes). However one of the important features, which is rather overlooked
Proceedings of Spie the International Society For Optical Engineering, Oct 1, 1991
* Available as a photocopy reprint only. Allow two weeks reprinting time plus standard delivery t... more * Available as a photocopy reprint only. Allow two weeks reprinting time plus standard delivery time. No discounts or returns apply. ... Standard delivery in the US is 7 to 10 business days and outside the US delivery is 4 to 6 weeks or longer. For further details, please see shipping policy. ... Listed below are the papers found in this volume. Click the paper title to view an abstract or to order an individual paper.
In ophthalmology and optometry a number of measures is used for describing quality of human visio... more In ophthalmology and optometry a number of measures is used for describing quality of human vision such as resolution, visual acuity, contrast sensitivity function etc. In this paper we will concentrate on the vision quality understood as a resolution of periodic object being a set of equidistant parallel lines of given spacing and direction. The measurement procedure is based on
Spectacle-wearers make up a considerable part of present-day society, so spectacles are one of th... more Spectacle-wearers make up a considerable part of present-day society, so spectacles are one of the most popular optical instruments - very simple instruments since they are in fact single lenses. On the other hand their mode of operation and the demands for imaging quality ...
Third order aberrations of the hybrid (glass-holographic) lenses with spherical and plano-convex ... more Third order aberrations of the hybrid (glass-holographic) lenses with spherical and plano-convex surfaces and pupil in contact are considered. The paper includes some analytical results obtained by computer ray tracing method.
Applications of Digital Image Processing XXXIX, 2016
Intraocular lens (IOL) is an artificial lens implanted into the eye in order to restore correct v... more Intraocular lens (IOL) is an artificial lens implanted into the eye in order to restore correct vision after the removal of natural lens cloudy due to cataract. The IOL prolonged stay in the eyeball causes the creation of different changes on the surface and inside the implant mainly in form of small-size local defects such as vacuoles and calcium deposites. Their presence worsens the imaging properties of the eye mainly due to occurence of scattered light thus deteriorating the vision quality of patients after cataract surgery. It is very difficult to study influence the effects of these changes on image quality in real patients. To avoid these difficulties two other possibilities were chosen: the analysis of the image obtained in an optomechanical eye model with artificially aged IOL as well as numerical calculation of the image characteristics while the eye lens is burdened with adequately modeled defects. In experiments the optomechanical model of an eye consisting of a glass “cornea”, chamber filled with liquid where the IOL under investigation was inserted and a high resulution CCC detector serving as a “retina” was used. The Modulation Transfer Function (MTF) of such “eye” was evaluated on the basis of image of an edge. Experiments show that there is significant connection between ageing defects and decrease in MTF parameters. Numerical part was performed with a computer programme for optical imaging analysis (OpticStudio Professional, Zemax Professional from Radiant Zemax, LLC). On the basis of Atchison eye model with lens burdened with defects Modulation Transfer Functio was calculated. Particular parameters of defects used in a numerical model were based on own measurements. Numerical simulation also show significant connection between ageing defects and decrease of MTF parameters. With this technique the influence of types, density and distribution of local defect in the IOL on the retinal image quality can be evaluated quickly without the need of performing very difficult and even dangereous experiments on real human patients.
Background: The paper presents a case report of an episode of local anesthetic systemic toxicity ... more Background: The paper presents a case report of an episode of local anesthetic systemic toxicity (LAST) with cardiac arrest after continuous femoral nerve blockade in a 74-year-old female patient after elective total knee replacement surgery. Case presentation: A 74-year-old patient burdened with hypertension, osteoarthritis, underwent elective total knee replacement surgery (TKR). After surgery, a continuous femoral nerve blockade was performed and an infusion of a local anesthetics (LA) was started using an elastomeric pump. Five hours after surgery, the patient had an episode of generalized seizures followed by cardiac arrest. After resuscitation, spontaneous circulation was restored and the patient was transferred to the Intensive Care Unit. 20% lipid emulsion was used in the treatment. On day 2 of the ICU stay, the patient was fully cardiovascularly and respiratorily stable without neurological deficits and was discharged to the orthopedic department to continue treatment. Conc...
Cataract is one of the most frequent reasons of blindness all around the world. Its treatment rel... more Cataract is one of the most frequent reasons of blindness all around the world. Its treatment relies on removing the pathologically altered crystalline lens and replacing it with an artificial intraocular lens (IOL). There exists plenty of types of such implants, which differ in the optical materials and designs (shapes). However one of the important features, which is rather overlooked
Proceedings of Spie the International Society For Optical Engineering, Oct 1, 1991
* Available as a photocopy reprint only. Allow two weeks reprinting time plus standard delivery t... more * Available as a photocopy reprint only. Allow two weeks reprinting time plus standard delivery time. No discounts or returns apply. ... Standard delivery in the US is 7 to 10 business days and outside the US delivery is 4 to 6 weeks or longer. For further details, please see shipping policy. ... Listed below are the papers found in this volume. Click the paper title to view an abstract or to order an individual paper.
In ophthalmology and optometry a number of measures is used for describing quality of human visio... more In ophthalmology and optometry a number of measures is used for describing quality of human vision such as resolution, visual acuity, contrast sensitivity function etc. In this paper we will concentrate on the vision quality understood as a resolution of periodic object being a set of equidistant parallel lines of given spacing and direction. The measurement procedure is based on
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Papers by Marek Zajac