State pensando di passare dalle lenti a contatto agli occhiali da vista? Convertire i parametri delle lenti a contatto in parametri per occhiali utilizzando una tabella di conversione di base è possibile.

Chi soffre di miopia può dare un'occhiata alla colonna con i poteri negativi (-). Chi soffre di ipermetropia può invece consultare quella con i poteri positivi (+).

La tabella non può essere utilizzata per convertire le prescrizioni per astigmatismo o multifocali. Le lenti per la correzione dell'astigmatismo utilizzano le misure del cilindro (CYL) e dell'asse (AX) per correggere gli errori di rifrazione relativi alla cornea, al cristallino o alla retina. Le lenti multifocali per la presbiopia richiedono la giusta cifra di addizionale (ADD) per la correzione da vicino.

Nella maggior parte dei casi, i poteri degli occhiali corrispondono direttamente a quelli delle lenti a contatto fino a +/- 3,50. Per le diottrie al di sopra di questo intervallo, gli optometristi utilizzano tabelle di conversione come quella illustrata qui sotto, per aiutare a determinare i valori appropriati.

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Manageability: High-density is the good but management is not easy. ODF should provide an easy management environment for technicians. The basic requirement is ODF should allow for easy access to the connectors on the front and rear of those ports for insertion and removal. This requires that ODF should reserve enough space. In addition, the color of adapters installed on the ODF should be remain consistent with the color code of fiber optic connectors to avoid wrong connections.

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No, le prescrizioni saranno diverse. Gli occhiali sono più distanti dagli occhi, mentre le lenti a contatto si indossano direttamente sulla cornea. Questo fa sì che i poteri necessari per correggere sia la miopia che l'ipermetropia possano differire. L'unica eccezione è rappresentata dalle prescrizioni monofocali con diottrie inferiori a +/-3,50, dove in alcuni casi le prescrizioni degli occhiali e delle lenti a contatto combaciano.

Attenzione: le tabelle di conversione non sostituiscono la prescrizione emessa dallo specialista. Questa tabella ha lo scopo di fornire indicazioni orientative e valori approssimativi. La cosiddetta refrazione soggettiva durante la visita oculistica è particolarmente importante e può determinare i valori finali utili a ottenere la miglior correzione del problema visivo.

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The ODF is the most popular and comprehensive fiber optic distribution frame which can reduce the cost and increase the reliability and flexibility of fiber optic network during both deployment and maintenance. The high density ODF is the trend in telecommunication industry. Selecting an ODF is important and complex which requires full consideration including applications and management. The factors like structure, fiber counts and protection are just the basic elements. The ODF which can meet the current requirements and the challenge of future growing and easing of expansion without sacrificing cable management or density can only be selected with repeated comparison and full consideration.

An optical distribution frame (ODF) is a frame used to provide cable interconnections between communication facilities, which can integrate fiber splicing, fiber termination, fiber optic adapters & connectors and cable connections together in a single unit. It can also work as a protective device to protect fiber optic connections from damage. The basic functions of ODFs provided by today's vendors are almost the same. However, they come into different shapes and specifications. To choose the right ODF is not an easy thing.

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Dipende! Le lenti a contatto offrono comodità e flessibilità a chi ha uno stile di vita attivo. Tuttavia, altri potrebbero trovare gli occhiali più comodi o convenienti. Il vostro oculista di fiducia può aiutarvi a stabilire se l'uso delle lenti a contatto è possibile per voi e idoneo ai vostri occhi.

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Convertire i parametri delle lenti a contatto in parametri per occhiali può essere facile e veloce. Se avete smarrito la vostra prescrizione, questa tabella può essere uno strumento utile.

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The selection of the ODF is not limited to the structure, many factors like applications should be considered. Some of the most important are introduced as following.

Wall mount ODF (shown in the following picture) usually uses a design like a small box which can be installed on the wall and is suitable for fiber distribution with small counts. Floor mount ODF adopts closed structure. It is usually designed with relatively fixed fiber capacity and nice appearance.

According to the structure, ODFs can mainly be divided into three types, namely wall mount ODF, floor mount ODF and rack mount ODF.

Flexibility: as mentioned rack mount ODF is relatively flexible during applications with the modular design. However, anther aspect which can increase the ODF’s flexibility effectively is the port size for adapters on the ODF. For example, an ODF with ports of duplex LC adapter size can be installed with duplex LC, SC or MRTJ adapters. An ODF with ports of ST adapter size can be installed with both ST adapters and FC adapters.

Driven by requirements for high-speed data rate, the deployment of fiber optic has been growing. As the growth of installed fiber optic, the management of optical transmission networks becomes more difficult. Many factors should be considered during fiber optic cabling, like flexibility, future viability, cost of deployment and management, etc. To handle large amounts of fiber optic with lower cost and higher flexibility, various optical distribution frames (ODF) are being widely used to the connector and schedule optical fiber. Choosing right fiber optic distribution frames is the key to successful cable management.

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Rack mount ODF (shown in the following picture) is usually modularity in design with firm structure. It can be installed on the rack with more flexibility according to the fiber optic cable counts and specifications. This kind of optical distribution system is more convenient and can provide more possibilities to the future variations. Most of the rack mount ODF is 19'', which ensures that they can be perfectly installed on to the commonly used standard transmission rack.

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Sapevate che potete utilizzare il calcolatore di conversione durante il processo di acquisto? Lo troverete nello Step III (Parametri). Date un'occhiata all'immagine qui sotto per vedere come si presenta il processo.

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Fiber Counts: with the number of fiber connections in places like data center increase, the need for high density ODF become the trend. And it is very common to find ODF with 24 ports, 48 ports or even 144 ports for fiber optic cables in the market now. Meanwhile, many vendors can provide the customized ODFs according to the customers' requirement.

Protection: optical distribution frames integrate fiber connections in it. The fiber connections like splicing joint, fiber optic connectors are actually really sensitive in the whole transmission network and is directly related to the stability and reliability of the network. Thus, a good ODF should have protection device to prevent fiber optic connections from damages produced by dust or stress.