COAS - Centro Optometrico di Alta Specialità del Dott. Antonio Pistarà

22/01/2026

19/01/2026

18/01/2026

Scientists at South Korea’s KAIST have developed a spray that instantly seals wounds by turning blood into a gel, stopping bleeding within seconds.

The powder designed to be sprayed on the wound reacts with charged particles in blood and forms a gel within about 1 second, forming a protective seal.

The spray is designed for deep or irregular wounds where bandages are ineffective, such as accidents or combat injuries.

Researchers say it can be applied faster than traditional dressings by simply spraying the injury.

The team hopes it will be used in emergency medicine and battlefield care to reduce fatal blood loss.

17/01/2026

PAZIENTE MORÌ DOPO INTERVENTO, OSPEDALE DI CATANIA CONDANNATO A PAGARE DUE MILIONI.

(redazione)

Il giudice del tribunale di Catania ha condannato l'Azienda ospedaliera Garibaldi al pagamento di circa 2 milioni di euro in favore dei sei familiari di un giovane di 29 anni deceduto il 28 gennaio 2016 dopo un intervento chirurgico di routine. Il paziente venne ricoverato d'urgenza nell'ospedale Garibaldi con diagnosi di appendicite acuta con peritonite.

L'intervento chirurgico venne eseguito senza apparenti complicazioni - dicono i legali dei familiari della vittima Rossella Danile e Raimondo Cammalleri - ma nelle ore successive, al giovane che aveva forti dolori post-operatori venne somministrata mezza fiala di Toradol per via endovenosa. Il paziente p***e conoscenza, andò in arresto cardiaco e, nonostante i tentativi di rianimazione, morì dopo poche ore. Il giovane lasciò la moglie, di 23 anni, e due bambine, una di 20 mesi e l'altra di 4 mesi, oltre a padre, madre e sorella. Dalle carte processuali - dicono gli avvocati - emerge un dato agghiacciante: nonostante il giovane fosse monitorato e avesse manifestato sintomi critici post-operatori, la prima verifica del ritmo cardiaco è avvenuta solo 15 minuti dopo l'arresto.

Secondo i periti, un intervento entro i primi minuti avrebbe garantito al giovane una probabilità di sopravvivenza superiore al 50%. La perizia ha stabilito che "qualora si fossero applicate correttamente le raccomandazioni previste dalla più accreditata letteratura scientifica e dalle linee guida sul trattamento dell'arresto cardiaco, si sarebbe potuto evitare il decesso con elevato grado di probabilità". "Il ritardo nell'attivazione delle procedure di emergenza, la mancata immediata valutazione del ritmo cardiaco e, soprattutto, l'omesso utilizzo del defibrillatore hanno inciso in modo causale sull'esito fatale" dicono gli avvocati.

"La sentenza ribadisce un principio centrale in materia di responsabilità medica: la struttura sanitaria risponde a titolo contrattuale non solo per l'atto chirurgico in sé, ma anche — e soprattutto — per la corretta sorveglianza e gestione del paziente nella fase post-operatoria. Un dovere che, nel caso di specie, è stato ritenuto violato in modo grave" dicono Danile e Cammalleri. La sentenza, pubblicata il 9 gennaio 2026, conclude un iter giudiziario durato quasi sette anni.

15/01/2026

👀 Everything you see—every star, planet, nebula, and galaxy—adds up to just 5% of the universe.

The remaining 95% is made of something we can’t touch, can’t see, and still can’t fully explain.

Astronomers call it dark matter and dark energy.

Dark matter acts like an invisible cosmic scaffold, holding galaxies together with a gravity we can’t detect directly. Dark energy, even stranger, is pushing the universe apart faster and faster, accelerating its expansion for reasons we still don’t grasp.

Think about that:
All of human history, every discovery we’ve ever made, happened inside a tiny fraction of what truly exists. Most of the cosmos is hidden, operating in ways that break our understanding of physics.

And yet, this mystery is the best part—because it means the universe we know is only the prologue. The real story is still out there, waiting to be uncovered.

14/01/2026

Understanding Polarization: How Light Organizes Its Motion

Light is an electromagnetic wave, meaning it consists of oscillating electric and magnetic fields that propagate through space. While the direction of travel of a light wave is straightforward, the orientation of its electric field can vary. This orientation behavior is known as polarization, and it plays a central role in optics, communications, imaging technologies, and many natural phenomena.

Polarization does not change the color or speed of light—it changes how the wave moves.

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Linear Polarization

In linear polarization, the electric field oscillates back and forth along a single, fixed plane as the wave travels forward.

This form of polarization often occurs when light passes through a polarizing filter, which selectively blocks all but one orientation of electric field vibration. A familiar example is polarized sunglasses, which reduce glare by blocking horizontally polarized light reflected from surfaces like water or roads.

Linear polarization is foundational in:
• Optical instruments
• Laser systems
• Liquid crystal displays (LCDs)
• Stress analysis in transparent materials

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Circular Polarization

In circular polarization, the electric field rotates continuously as the wave propagates, tracing a circular path over time. This rotation can occur in either a right-handed or left-handed direction, depending on the phase relationship between perpendicular field components.

Circular polarization is commonly produced when linearly polarized light passes through a quarter-wave plate or reflects from certain surfaces.

It is widely used in:
• Optical data storage (CDs, DVDs, Blu-ray)
• Satellite and wireless communication systems
• Radar technology
• 3D imaging and displays

Circular polarization is particularly useful in systems where the orientation between transmitter and receiver may vary, as it is less sensitive to alignment.

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Elliptical Polarization

Elliptical polarization is the most general case and includes both linear and circular polarization as special forms. Here, the electric field traces an ellipse as it propagates.

This occurs when the perpendicular components of the electric field have:
• unequal amplitudes, and/or
• a phase difference other than 90 degrees

Most naturally occurring polarized light is elliptically polarized, including light that has passed through complex materials or reflected from non-ideal surfaces.

Elliptical polarization is important in:
• Advanced optical characterization
• Remote sensing and astronomy
• Biomedical imaging
• Anisotropic material studies

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Why Polarization Matters

Polarization reveals that light is not just energy moving through space—it is structured motion. By controlling or measuring polarization, scientists and engineers can extract information about materials, surfaces, fields, and environments that would otherwise remain hidden.

From glare reduction to quantum optics, from telecommunications to biological imaging, polarization is a quiet but essential dimension of how light interacts with reality.

Understanding polarization is not about abstraction—it is about learning how nature organizes oscillation, orientation, and flow at the most fundamental level.

09/01/2026