CHOOSING RIGHT LIGHT FOR OPTIMAL EYE HEALTH.

1. CHOOSING RIGHT LIGHT
FOR OPTIMAL EYE HEALTH
PARNA DHARA
M.OPTOM

2. CONTENTS
1. DIFFERENT TYPES OF LAMP
2. CHOICE OF LIGHT FOR HEALTHY EYE
3. CHOICE OF LIGHT FOR DIFFERENT EYE
DISEASE CONDITION

3. DIFFERENT TYPES OF LAMP
• Incandescent lamp generate light through heat
• Infrared radiation of high intensity can produce
corneal damage, cataract, thermal injury to retina
• It gives yellow red light(warm)emit uv radiation
• Application: Domestic, commercial, industrial
• Generate heat in current supply
• Longer exposure to the light cause eye stain,
sore, burning, watery or dry eye.
• It gives bright white (cool)light. emit uv radiation
• Aplication: Commercial, residential, industries

4. DIFFERENT TYPES OF LAMP
• It is a form of infrared radiation (heat)
• It emit warm yellow light
• Long term exposure cause cataract
• Application: indoor, outdoor, vehicle,
studios, signalling etc.
• High pressure sodium cause efficient brightness
• Generate lot of heat
• Produce a dark pink glow(warm)
• If staring at HPS light for few second cause
permanent damage to eye, like bleaching retina
• Application: street lamps, factories

5. DIFFERENT TYPES OF LAMP
• Exposure to broken metal halide Cause eye
irritation, photokeratitis.
• It generate very cool white light
• Applications: indoor, shopping moll,
showrooms, super market.
• If the outer blub break inner tube continue produce light
then uv radiation is emitted cause eye burning, double
vision, headache
• It gives a cooler colour appearance.
• Application: street, factories, parking lot etc

6. • It emit uv radiation but smaller amount.
• CFL are ok for our eye.
• CFL are available in verity of shades from warm
white to cool white
• Application: traffic signals, display, flash light etc.
• LED radiation can cause irreversible damage to the
retina. phototoxic effect of blue light exposure
increase risk for ARMD.
• LED light create a minimum amount of uv rays.
• Varity of shades LED lights are available warn to
cool light
• Application: traffic signals, display, flash light,
under counters.

7. INDOOR LIGHTING
Home Lighting:
• Lighting at home should be characterized by the relaxed and cozy feeling that warm white sources give and
also by good color rendering (it is important to be able to see the color of your chosen decoration, your
• clothes, the food you prepare, etc.).
• A lamp that can satisfy both these requirements is the halogen lamp, and it is indeed for this reason why
homes around the world are dominated by incandescent lighting. The cost of the bulb was also another
reason,
• but as more and more people focus on energy savings, the options of fluorescent sources and LEDs are
becoming popular.
• The advantage of LEDs is the long lifetime, the flexibility in geometries and shapes for decorative lighting,
and the ability to create dynamic lighting and a range of atmospheres and colors.
CHOICE OF LIGHT FOR HEALTHY EYE

8. Kitchen
Food requires a high color-rendering source, so halogen lamps or LED and fluorescent lamps with a high Color
Rendering Index (CRI) are recommended (fluorescent lamps with silicon coating for containment of toxic materials
in case of breakage are available).
Living Room
This is an area where people want a relaxed environment, so a warm source is needed. Halogen lamps are usually
chosen, but warm white fluorescent lamps are also suitable. For more atmosphere and dynamic lighting, LED
systems are suggested.
Bedroom
This is a room where a warm source is needed to create a relaxed environment, so halogen lamps are usually chosen,
but warm white fluorescent and warm white LED lamps can also be used.
Study Room
One should be able to focus in this room, so cool white fluorescent lamps or cool white LEDs are proposed.
Storage Room
Color rendering, high luminance, or specific color temperature are not important here, so unless other issues point to
a specific lamp then LED lighting offering long lifetimes is the proposed one.

9. Corridors/Stairs
Color rendering, high luminance, or specific color temperature are also not important here, but instant start,
frequent switching, and long lifetime would be. So unless other issues point to a specific lamp, then again LED
lighting would be the proposed solution.
Bathrooms
When it comes to bathrooms there are two options, opposite from each other. One can choose halogen lamps,
which create a relaxed atmosphere and also heat up the space, or choose cool white sources (cool fluorescent
or LED lamps), which give the impression of cleanliness.
Work environments
Meetings: Use a medium level of brightness and high color temperature for stimulation.
Focused work: Use high color temperature and high brightness levels for office work that demands focus.
Relaxation: Use low brightness levels and low color temperature for resting or for hosting guests.
.

10. CHOICE OF LIGHT FOR DIFFERENT EYE DISEASE
CONDITION
A cataract is a clouding that develops in the crystalline lens of the eye, increasing the absorption and scatter of
light. More light will help overcome the increased absorption, but if scattering is high it will reduce
visual capabilities (higher sensitivity to glare).
A good way to enhance color discrimination for older people without using high levels of illumination (to avoid
glare) is simply to use a source with a high Color Rendering Index.
Early in the development of age-related cataract the power of the lens may be increased, causing near-
sightedness (myopia), and the gradual yellowing and opacification of the lens may reduce the perception of blue
colors. A source with intense red emissions might help overcome the above issues, as longer wavelengths will
penetrate the lens and the rest of the eye to a higher degree, and will be refracted and scattered less.

11. Glaucoma is an eye disorder in which the optic nerve suffers damage, permanently damaging vision in the affected
eye(s) and progressing to visual field loss and complete blindness if untreated. It is often, but not
always, associated with increased pressure of the fluid in the eye (aqueous humor). The treatment of glaucoma is
based on reducing intraocular pressure, either with medicines or by surgery. Since glaucoma first affects the
peripheral vision and worsens the ability to see at night, light sources emitting light with medium and long
wavelength emissions (neutral and warm white sources) might prove useful.
Foveal vision is characterized by a peak at 555 nm (green-yellow) of the eye sensitivity curve. Halogen and warm
white or neutral white fluorescent and LED lamps are recommended. UV filters and minimization
of blue emissions are desired in order to reduce glare, and more damage.
Age-related macular degeneration is a medical condition that results in a loss of vision in the center of the visual
field (the macula) because of damage to the retina. The macula, which is a circular, yellow-pigmented
area of the retina, two to three millimeters in diameter and centered on the fovea, changes in appearance. Macular
degeneration can make it difficult to read or recognize faces, although enough peripheral vision remains to allow
other activities of daily life. Higher levels of illumination (task lighting) and magnification of images can help at
early stages.

12. Because the peripheral vision outside the macula is unaffected, one might consider the use of light sources with
shorter wavelength emissions (blue or cool white lamps); however, the use of such sources may accelerate the
damage due to the detrimental effect and photo-oxidative stress short wavelengths have on to the retina. The only
proposal here is to use high color-rendering sources (warm white) in order to increase color contrast and increase
the illumination levels.
Diabetic retinopathy, as the name implies, is damage to various parts of the retina due to diabetes. The changes
it produces in the vascular system that supplies the retina have effects on the visual capabilities depending on
where on the retina the damage occurs. The simple rule of medium- and long-wavelength sources for reduced
peripheral vision applies here too.
Retinitis pigmentosa (RP) is a group of genetic eye conditions that leads to incurable blindness. In the
progression of symptoms for RP, night blindness generally precedes tunnel vision by years or even decades. Since
retinitis pigmentosa first affects the night vision and proceeds to tunnel vision, sources emitting medium and
longer wavelengths might again prove useful. Halogen lamps or neutral and warm white fluorescent and LED
lamps are proposed. Patients with retinitis pigmentosa can also have increased levels of intraocular light scatter so
the choice of these light sources also helps in this respect.