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If your eye floaters and flashes are caused by a retinal detachment or retinal tear, you may require urgent treatment. A retinal tear can usually be treated with a laser. This treatment is called laser retinopexy. We treat retinal detachment with surgery – the type of surgery depends on various factors, including size, duration and location of the detachment.

The vitreous gel bumping or tugging against the retina of your eye can cause flashes of light. Persistent flashing lights with more floaters can be a sign of a retinal tear or retinal detachment, which can lead to permanent vision loss if left untreated. It’s hard to know the cause yourself, so you should seek the advice of an eye care specialist.

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For Measurement of Luminous Flux By definition, Luminous Intensity is the luminous flux per solid angle in a specified direction of radiation. If I is the luminous intensity in Candela (cd), φ the luminous flux in Lumens (lm) and ω the solid angle in Steradians (sr), then I = φ/ ω.

It covers LED based SSL products with control electronics and heat sinks incorporated , that is, those devices that require only AC mans power or a DC voltage power supply to operate. It also covers SSL products in a form of luminaries (fixtures incorporating light source) as well as integrated LED lamps.

As discussed, age is the biggest risk factor for floaters and flashes of light. You are more likely to experience floaters if you are over 50, are nearsighted (myopia), or have diabetes. Blood in your eye can also lead to experiencing them. This is less common, though you are more likely to experience this if you have diabetes, sickle cell disease or some other type of retinal disease.

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Eye floaters and flashes of light are likely to increase as you age and are completely normal. However, there are circumstances when you should get these checked by a specialist.

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Do you see small dots, squiggly lines, rings or cobweb-like shapes drifting across your vision? We call these eye floaters. They will still be there if you blink, though they may become easy to ignore. Floaters may look black or grey, like a shadow.

If you are experiencing eye floaters, you should get your eye checked regularly to monitor your vitreous and prevent severe eye problems later on. We can remove them surgically, though this is not usually necessary. Moving your eyes by looking up and down or left and right can help shift the floater to a less disturbing position.

ITC India Pvt Ltd owns the scope of Accreditation to perform the following repetitive photometric measurements for light sources (electric lamps) and luminaries in the laboratory, which are used for the purpose of illumination involving either Spherephotometry or Goniophotometry.

If you’ve had eye problems previously, including eye surgery, you also have a higher risk. Additional risk factors include inflammation in the eye (uveitis) and complications from cataract surgery.

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In the zonal method, the light source is imagined to be at the center of a large sphere. The sphere is divided into horizontal zones whose upper and lower boundaries subtend angles θ2 and θ1 with the vertical axis at the center of the sphere. The zonal flux between the angle, θ1 and θ2 is given by Iθ * ZF Where Iθ – Average intensity within the zone and ZF – 2 *π* (Cos θ1 – Cos θ2) steradians In the 5 zonal method, the sphere is divided into 36 zones, while in the 10o zonal method, the sphere is divided into 18 zones. The sphere can further be divided into smaller and differential zones depending upon application.

At your appointment, our specialist will ask about your symptoms to see how long and often you’ve had them. We will also examine your eyes to check for eye floaters and check for any signs of more serious causes. We may recommend further tests to rule out or diagnose an underlying cause. Then, we will discuss our findings with you and recommend treatment options where required.

If you are experiencing eye floaters or flashes of light, book an appointment to discover the cause of your symptoms. Our specialists will provide a thorough consultation and perform any necessary tests.

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Flashes are brief flashes of light, similar to camera flashes, over your vision. They are sometimes mistaken for a streak of lightning. You may experience floaters alongside flashes of light or separately.

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Have you experienced dark shapes or frequent flashes of light over your vision? Book a private appointment to receive an expert opinion on your eye health.

(Integrating sphere) Spherephotometry is used for the determination of total luminous flux output of light sources and measurement of light output ratio (LOR) of luminaries. Sphere photometry works on Ulbricht’s theory, according to which the luminous flux of the light source is related to the indirect illuminance on the internal surface of the integrating sphere by

Luminous Flux: It is a measure of the total optical output of a visible light source. Luminous flux is expressed in lumens.  The measurement requires all of a source’s power to be concentrated on a detector. This can be a problem with divergent sources like LEDs, and lamps. In these cases, integrating spheres are often used.

Flashing lights are more common if you suffer from migraines and are usually associated with headaches. If you only see flashing lights, you may want to speak to your doctor before speaking to an eye specialist. You should also speak to a doctor if you have blurred vision or dizziness.

Illuminance: The illuminance of a surface is the amount of light incident upon the surface, divided by the area of the surface. It is measured in either foot candles (lumens per square foot) or lux (lumens per square meter).

Photometry is modern science to measure the visible light in terms of its perceived brightness to human vision. The basic unit of photometry is lumen (lm). The inverse square law and cosine law are the two laws used in photometry. The inverse square law states that the intensity per unit area on the surface varies ins inversely proportional to the square of distance between the source and surface. Whereas the cosine law indicates the intensity of light on a surface of a fixed area varies with the incident angle. In fact, the intensity falls off as the cosine of the angle.

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Photometry testing: This is a approved method which describes the procedure to be followed and precautions to be observed in performing reproducible measurements of total Luminous flux, electrical power, luminous intensity distribution and chromaticity, of solid state lighting (SSL) products for illumination purposes, under standard conditions.

θ – angle of incidence in steradians, measured relative to the normal to the acceptance area Measurement of luminous intensity is generally done in any one of the three system of planes, viz. A-α, B-β and C-γ

For Measurement of Luminous Intensity Goniophotometry is used for the measurement of luminous intensity of luminaries in specific directions as well as determination of total luminous flux output of light sources. It is also used for the measurement of light output ratio (LOR) of luminaries. Luminous Intensity (I) is determined from the measured illuminance value and the calculated photometric distance, as per the following formula:

The most common cause of eye floaters is age. The vitreous (a gel-like substance inside your eye) shrinks and becomes more watery as you age. As this happens, the vitreous pulls away from the eyeball’s inside surface (posterior vitreous detachment), which can cause flashes in the corner of your eye. The vitreous clumps and moves around in the eye as it is more mobile, seen as floaters.

Reason for enquiry? —Please choose an option—Laser Eye SurgeryCataract SurgeryRefractive Lens ExchangeImplantable Contact Lens (ICL)Keratoconus TreatmentDry Eyes & BlepharitisAesthetics/BlepharoplastyEyelidCorneaGlaucomaRetinaOther