T Liu · 2017 · 28 — In rotationally symmetric optical systems, oblique astigmatism occurs for object points displaced from the optical axis of symmetry as described quantitatively ...

Infraredlens

Bifocal lenses are designed to correct two different prescriptions, usually a combination of distance and near correction. They help in correcting both the far-sighted & near visions. They can be distinguished by the visible line across the lens.

Understanding your visual needs and making an informed choice is important to achieve the desired visual outcome. Different prescriptions have different lens solutions.

Fresnellens

Purchasing optical lenses isn’t an easy task. Choosing the right type of lenses is important to achieve the clearest and sharpest vision. When looking for lens types, there are various factors that you must consider. Here’s a complete guide on everything you need to know about optical lenses.

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For example, if you are near-sighted (myopic) or long-sighted (hyperopic), your lens choice will be different to someone who has presbyopia (the gradual loss of the ability for the eyes to focus on near objects). People with presbyopia may need special lenses such as bifocal, progressive or multifocal lenses to correct their vision.

Anti-reflective coatings reduce the reflections from your optical lenses. This helps reduce the amount of light going in to your eyes, helping with light sensitive eyes. In addition to that, they make your eyes more visible through the lenses, as they have less light reflecting off the lens surface. This is particularly useful when you are wearing glasses in photos.

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Con il termine di biometria intendiamo la misurazione di alcuni parametri oculari (in particolar modo curvatura corneale e lunghezza assiale) che permettono di calcolare il potere diottrico delle lenti intraoculari prima dell’intervento di cataratta. La lente artificiale che viene inserita al posto del cristallino opacizzato ha un proprio potere diottrico, in maniera simile alle lenti degli occhiali o alle lenti a contatto. Il chirurgo deve pertanto calcolarne il potere più appropriato per ogni paziente, in modo da ridurre al massimo l’uso degli occhiali dopo l’intervento. Questi calcoli vengono effettuati sulla base di due misurazioni, che nel loro insieme sono chiamate biometria: la curvatura corneale e la lunghezza assiale dell’occhio. La curvatura della cornea è misurata con un topografo corneale, strumento in grado di ricostruire la forma della cornea generando delle mappe corneali. I medici dello Studio Oculistico d’Azeglio dispongono di uno dei topografi più sofisticati, il Keratron della Optikon 2000 (foto a destra). Inoltre il potere corneale viene misurato attraverso due Scheimpflug cameras, il Sirius ed il Pentacam, strumenti indispensabili per calcolare l’astigmatismo corneale totale, ovvero l’astigmatismo della superficie corneale anteriore e posteriore. L’importanza di tale misurazione è cresciuta nel corso degli anni, dal momento che il miglioramento delle tecnologie e delle nostre conoscenze ha portato ad un utilizzo sempre maggiore delle cosiddette lenti toriche per la correzione anche di astigmatismi di bassa entità. I chirurghi dello Studio Oculistico d’Azeglio oggi mirano alla correzione di tutti gli astigmatismi superiori alle 0.5 diottrie.

Cameralens

The polarisation treatment can be found in sunglasses to reduce glare. It works by blocking horizontal light rays which. This enables the wearer to see better with enhanced comfort and vision clarity, without the effects of glare. This is particularly useful for driving and in environments with water.

Lens

Single vision lenses are ideal for correcting myopia (near-sightedness) or hyperopia (far-sightedness), and/or astigmatism. In other words, they have a single optical prescription correction throughout the whole lens.

Lens material matters when selecting your lenses. High prescriptions make the lenses thicker, therefore choosing a high index lens material will help reduce the thickness of the lens. Other types of lens materials include polycarbonate or trivex which are more impact resistant.

– Savini G, Hoffer KJ, Schiano-Lomoriello D. Agreement between lens thickness measurements by ultrasound immersion and optical biometry. J Cataract Refract Surg 2018;44:1463-1468.– Savini G, Negishi K, Hoffer KJ, Schiano-Lomoriello D. Refractive outcomes of intraocular lens power calculation using different corneal power measurements with a new optical biometer. J Cataract Refract Surg 2018;44:701-708.– Savini G, Hoffer KJ, Shammas HJ, Aramberri J, Huang J, Barboni P. Accuracy of a new swept-source optical coherence tomography biometer for IOL power calculation and comparison to IOLMaster. J Refract Surg 2017;33:690-695.– Hoffer KJ, Savini G. IOL power calculation in short and long eyes. Asia Pacifc J Ophthalmol 2017;6:330-331.– Hoffer KJ, Shammas HJ, Savini G, Huang J. Multicenter study of optical low-coherence interferometry and partial-coherence inteferometry optical biometers with patients from the United States and China. J Cataract Refract Surg 2016;42:62-67.– Savini G, Hoffer KJ, Lombardo M, Serrao S, Schiano-Lomoriello D, Ducoli P. Influence of the effective lens position, as predicted by axial length and keratometry, on the near add power of multifocal intraocular lenses. J Cataract Refract Surg 2016;42:44-49.– Savini G, Barboni P, Carbonelli M, Ducoli P, Hoffer KJ. Intraocular lens power calculation after myopic excimer laser surgery: selecting the best method using clinically available data. J Cataract Refract Surg 2015;41:1880-1888.– Hoffer KJ, Aramberri J, Haigis W, Olsen T, Savini G, Shammas HJ, Bentow S. Protocols for studies of intraocular lens formula accuracy. Am J Ophthalmol 2015;160:403-405.– Savini G, Hoffer KJ, Barboni P. Influence of corneal asphericity on the refractive outcome of intraocular lens implantation in cataract surgery. J Cataract Refract Surg 2014;41:785-789.– Savini G, Naeser K. An analysis of the factors influencing the residual refractive astigmatism after cataract surgery with toric intraocular lenses. Invest Ophthalmol Vis Science 2015;56:827-835.– Savini G, Barboni P, Ducoli P, Borrelli E, Hoffer KJ. Influence of intraocular lens haptic design on refractive error. J Cataract Refract Surg 2014;40:1473-1478.– Savini G, Bedei A, Barboni P, Ducoli P, Hoffer KJ. Intraocular lens power calculation by ray-tracing after myopic excimer laser surgery. Am J Ophthalmol 2014;157:150-153.– Savini G, Hoffer KJ, Carbonelli M, Ducoli P, Barboni P. Influence of axial length and corneal power on the astigmatic power of toric intraocular lenses. J Cataract Refract Surg 2013;39:1900-1903.– Savini G, Barboni P, Carbonelli M, Hoffer KJ. Comparison of methods to measure corneal power for intraocular lens power calculation using a rotating Scheimpflug camera. J Cataract Refract Surg 2013;39:598-604.– Savini G, Barboni P, Carbonelli M, Hoffer KJ. Accuracy of corneal power measurements by a new Scheimpflug camera combined with Placido-disk corneal topography for intraocular lens power calculation in unoperated eyes. Journal of Cataract and Refractive Surgery 2012;38:787-792.– Savini G, Barboni P, Carbonelli M, Hoffer KJ. Accuracy of a dual Scheimpflug analyzer and a corneal topography system for intraocular lens power calculation in unoperated eyes. J Cataract Refract Surg 2011;37:72-76.

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Photochromatic treatment, often referenced as Light Adaptive, is when a normally clear lens turns dark when exposed to direct UV sunlight, and turns back to clear when indoors (without UV). This is particularly useful when transitioning from indoor to outdoor environments frequently during the day, as it works like a sunglass when outside.

La lunghezza assiale dell’occhio viene misurata per mezzo di uno strumento (il biometro) dotato di una sonda ad ultrasuoni. Lo Studio Oculistico d’Azeglio è dotato di un biometro ad ultrasuoni, l’OcuScan dell’Alcon (foto a destra). Tutte le misurazioni sono effettuate con la tecnica ad immersione, che non prevede il contatto diretto della sonda ad ultrasuoni con la superficie dell’occhio.

Dal febbraio 2014 lo Studio Oculistico d’Azeglio è dotato anche di un secondo biometro ottico, il Tomey OA-2000. Tomey, azienda giapponese che da numerosi anni costruisce strumenti oftalmici, ha infatti scelto il nostro studio per introdurre sul mercato europeo e sviluppare questo strumento.

Most people don’t make any considerations while purchasing spectacle lenses. However, it’s one of the most common mistakes they make.

Eyelens

The correct type of lens will be based on your prescription and vision needs. Lifestyle and workplace environment are also factors you need to consider when choosing the type of lens. These will vary from single vision, progressive, or extended focus lens types.

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Progressive lenses (or multifocal lenses) are designed with a smooth progression from a distance prescription from the top of the lens, down to a near prescription. This enables the wearer to see all the way from the distance, up to near focus lengths, and everything in between. Progressive lenses have become the lens of choice for most people with presbyopia as it helps the viewer see all focus distances without a visible line.

Extended focus lenses are similar to progressive lenses in that they are a smooth transition from different focus distances. They are usually prescribed to correct intermediate and near vision, and everything in between. These lenses are particularly useful for presbyopes in the office.

Convexlensimaging

With so many things to consider when selecting the right lenses, it’s important to have a great team of optometrists and optical dispensers look after your vision needs. They have the expertise to help you with the best selection of optical lenses suited for your individual life.

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Dal febbraio 2016 al gennaio 2018 abbiamo aggiunto un terzo biometro ottico, il Galilei G6 della Ziemer, il primo biometro che contiene al proprio interno una Scheimpflug camera, mentre ad aprile 2017 abbiamo ricevuto il quarto biometro ottico, il Pentacam AXL della Oculus.

Un caso a parte è rappresentato dal calcolo della curvatura corneale negli occhi precedentemente operati di chirurgia refrattiva con laser ad eccimeri. In tale evenienza sono necessari calcoli più complessi, per i quali lo Studio Oculistico d’Azeglio è diventato un punto di riferimento a livello internazionale grazie alla pubblicazione di numerosi lavori scientifici sull’argomento ed allo sviluppo di uno specifico foglio di calcolo, l’Hoffer/Savini LASIK IOL Power Tool (clicca qui per andare al sito dello IOL Power Club e scaricare il file).

Corso avanzato di biometria Gennaio 2019: leggi di piùCorso avanzato di biometria Gennaio 2018: leggi di piùCorso avanzato di biometria Febbraio 2017: leggi di piùCorso avanzato di biometria Gennaio 2016: leggi di piùCorso avanzato di biometria Dicembre 2014: leggi di piùCorso avanzato di biometria Dicembre 2013:leggi di più

Lens treatments improve durability, appearance and the performance of your glasses. It helps to protect your lenses from minor scratches, in case you drop them. They also help to reduce the amount of light reflections, helping with visibility and light sensitivity.

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Anti-scratch coatings are designed to protect optical lenses from scratches and grazing. They are usually a protective coating on the outer surface of the lens that act as a barrier to minor scratches. This makes the surface of the lens harder and more durable, making the lenses scratch-resistant.

Dal dicembre 2013 grazie alla collaborazione con Topcon è disponibile anche un biometro ottico, l’Aladdin (foto a sinistra). Questo, invece di utilizzare gli ultrasuoni, misura la lunghezza dell’occhio per mezzo della luce. Aladdin è inoltre dotato di un topografo corneale, che permette una valutazione accurata della superfice e della curvatura corneale.

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Amministrazione: amministrazione@studiodazeglio.it Pec: amministrazione@pec.studiodazeglio.it Segreteria: info@studiodazeglio.it Dott. Piero Barboni: p.barboni@studiodazeglio.it Dott. Giacomo Savini: g.savini@studiodazeglio.it

L’esperienza acquisita negli anni, la costante ricerca a livello scientifico e la possibilità di avere a disposizione gli strumenti più sofisticati garantiscono i migliori risultati per i nostri pazienti e fanno dello Studio Oculistico d’Azeglio un punto di riferimento nazionale ed internazionale per i chirurghi della cataratta che si occupano di biometria, come dimostrato dai corsi tenuti dal 2013 ad oggi.

Trifocal lenses are made up of three different prescriptions; usually distance, intermediate and near. These enable you to focus on three different focus distances which can be suitable for presbyopia. These lenses can be distinguished by two visible lines across the lens.

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To select your spectacle lenses, it is vital to determine your prescription to correct your vision needs. It is important to have your eyes checked regularly to determine the most up to date prescription. Wrong or out of date prescriptions can lead to worsening vision or eyestrain and headaches.

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Gli eccellenti risultati ottenuti nel corso degli anni sono stati pubblicati (caso unico in Italia) sulle più importante riviste scientifica del settore, quali Ophthalmology, il Journal of Cataract and Refractive Surgery, Investigative Ophthalmology and Visual Science, e l’American Journal of Ophtalmology:

UV-blocking treatments reduce the amount of UV transmitting through the lens. This helps reduce the amount of exposure to the sun’s harmful UV radiation which can lead to eye issues such as cataracts and pterygiums. UV blocking treatments help protect the eyes from sun damage.

Convexlens

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Consider your lifestyle and vision needs as a whole. For example, you may be sitting in an office all day at work, and enjoy running or outdoor sports on the weekends. In this case, you may benefit from an extended focus lens design to help see screens and documents at work, and sunglasses with polarisation for outdoor activities.