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contrast sensitivity test
 
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Fiordland - New Zealand

 

The Hamilton Veale
Contrast Sensitivity Test

New!
The Hamilton Veale
Eye Test


Complete Contrast Sensitivity and Home Eye Test Kit - Only
$149 USD

Test your eyes at home.
FREE shipping on all orders.
100% Satisfaction Guaranteed.



Contrast Sensitivity and Eye Test Professional Pack - Only
$349 USD

For professional use only.
FREE shipping on all orders.
Lifetime replacement warranty.


TEST YOUR OWN EYES

Seeing is our most important sense. About 80% of all our knowledge and management of daily life skills, are done by our vision. All medical doctors include a visual check, and in developed countries, vision is tested from birth, right through life, regularly. As we age, vision in general deteriorates. As a result, Eye Specialists recommend regular eye checks. These will include:
1. Refraction – calculation of the power of the eyes.
2. Media examination – to check for cataracts and other opacities.
3. Fundii examination – to observe the integrity of the back of the eye.
4. Intraocular pressure – to exclude glaucoma or the possible development of glaucoma.

And, of course, the eyes ability to see.

Distance Vision is checked by a Snellen Chart. Each eye is checked to record the smallest letters seen.

Near Vision is checked on a chart like the Rose-Blackbirds near chart.

Distortion of Vision is checked on an Amsler Chart.

These three important eye tests are available on the Hamilton-Veale Eye Test. It can be used by General Practitioners, Doctors, Nurses, School Teachers, People working with older folk, or by yourself.

The chart is simple to use:

The 3-metre Distance Chart should be placed at three metres or 10 feet. Hold your hand over one eye and read down to the smallest line. Record the letter under the line achieved, I.E. 9=6/9 12=6/12. Read down with the other eye and record, then do the same with both eyes looking.

The Log MAR Reading Test should be done holding the chart in your hands at your normal reading distance. Test each eye, covering the other and reading to the smallest row seen. Record the N level, for example, N8 right, N12 left, N8 both eyes.

The Amsler Grid Eye Chart should be used to test distortion of vision in each eye individually. Look closely at the spot in the centre of the grid. If there is any distortion observed at all, an immediate eye examination is essential. Distortion of the lines will often indicate retinal changes and that could be due to numerous causes and especially macular changes. If the lines are grey or there are blank areas on the grid, media opacities or field loss, could be the cause. Immediate consultation with your Eye Specialist is essential. Urgent self referral may save your vision.

Cataracts
If you have been diagnosed with cataracts, a drop in your ability to see as clearly from your last eye test, may indicate that the cataract has got worse.

Macular Degeneration
If there is a drop in visual acuity at distance or near, or there is distortion or shadows on the Amsler Chart, an urgent Eye Specialists consultation is necessary.

Glaucoma
Regular eye checks are required if glaucoma is diagnosed, but if there is a loss of visual acuity or greyness observed when testing on the Hamilton-Veale Eye Test, an urgent consultation with your Eye Specialist is recommended.

Refraction
As we age, all of us will have a change in the power of the eyes. A power anomaly will result in poor visual acuity and this can be detected by the Hamilton-Veale Eye Test, and an optometrist eye examination is indicated.

Diabetic Retinopathy
Can lead to a loss of visual acuity and distortion on the Amsler Gold Eye Chart and an urgent consultation with an Eye Specialist is essential.


Test your Own Eyes
Why test my own eyes? Eye examinations are expensive. However, they are the only way a diagnosis can be made, which would lead to treating the visual problem.
There is no harm done testing your own eyes regularly, as if deterioration is noticed, and an Eye Specialist’s consultation sort, you may save your sight. It is well recognised that the earlier a diagnosis or help is sort, the more chance that sight can be saved.
If you are concerned about a loss of vision, now or in the future, you should test your eyes from time to time. It is important to record your finding. On the calendar is a good place. If a change or loss in vision is detected, a prompt call to your Eye Specialist is advised. In that way your vision could be saved. Many people do not notice a loss in one eye, so test each eye individually.

 

The Hamilton-Veale Eye Test

Test your eyes at home with a professional kit containing;

Distance Vision Test
This is a 3 metre/10feet Snellen visual acuity test. This test is the same all eye doctors and general practices use. Set it up at home or your consulting room at a distance of 10 feet. Cover one eye and read to the lowest row of letters. The row of letter has a number beneath. Record this number, then test the other eye. Record, then test and record looking with both eyes.
6/6 = 20/20 6/9=20/30 9/12=20/40 6/18=20/60 6/24=20/80 6/60=20/200
A loss in one line in Visual Acuity is significant and urgent eye specialist appointment should be made.

Near Vision

The Rose-Blackbirds LogMAR near vision test is used around to the world. It is used to calculator the reading power required for people with presbyopia and those over 40 years of age.
It is also used by the Low Vision profession to calculate the magnification needed to read comfortably.
The rule of thumb is that one needs to see the N5 or 0.4 logMAR to read newsprint.
Test each eye individually then together. If there is a difference between eyes or N5 is not seen, an eye specialist's consultation is recommended. If a loss of vision of 2 lines on the Rose-Blackbirds chart is noticed and urgent appointment should be made with an eye specialist.

Macular Check
If there is a drop in visual acuity at distance or near, or there is distortion or shadows on the Amsler Chart, an urgent Eye Specialists consultation is necessary.
A macular degeneration check is essential for any people over 60 years of age.

The Hamilton-Veale Eye Test is an essential set for;
All Doctors, use in consulting rooms, home and rest home visits and by people who want to test their own vision.

The Hamilton Veale
Home Eye Test
order complete pack

Home Eye Test - Only
$89 USD

FREE shipping on all orders
100% Satisfaction Guaranteed.

 


Test your own eyes at home for cateracts, glaucoma, and macula degeneration.

If you have been told by your eye specialist that you are developing cataracts, or have glaucoma, or macular degeneration, the Hamilton-Veale contrast sensitivity test is an essential way to monitor changes in the condition of your eyes.

Save Money.

The Hamilton-Veale Contrast Sensitivity Test will save you money. If you find your level of contrast recorded remains the same, there is probably no need to visit your eye specialist. However, if there is a change detected on testing your eyes with the Hamilton-Veale contrast sensitivity chart, an immediate eye examination by your specialist is advised.

How bad are my cataracts?

People with normal vision can see to level 13 on the Hamilton-Veale Contrast Sensitivity Chart and some with exceptional vision, to level 15.
As an eye condition deteriorates, the level number will decrease. When the level recorded is between 9 and 12, a further eye examination by your eye specialist is advised.

Testing yourself for glaucoma and macular degeneration. Record your results.

A simple record of regular results made from testing with the Hamilton-Veale Contrast sensitivity Chart will indicate stability of your eye condition or deterioration. There may be minor fluctuations of the results due to: testing time of the day, lighting and how you are feeling. If there are fluctuations test daily, until a stable result is recorded. If there is a consistent deterioration, consult your eye specialist immediately. Take the chart and results with you, when you consult your eye specialist, so that they can see the reason for your visit.

Remember, the test does not compensate for a thorough eye examination.

Our Home Test Kit is the affordable and easy to use solution for testing your own eyes to find evidence of cataracts, glaucoma or macular degeneration.
The Home Test Kit includes one Hamilton-Veale Contrast Sensitivity Test, usage instructions, and a sheet for keeping a record of your level and progress.

The Hamilton Veale
Contrast Sensitivity Test

order complete pack

Contrast Sensitivity Test - Only
$89 USD

FREE shipping on all orders
100% Satisfaction Guaranteed.

 

What is a Contrast sensitivity test

A contrast sensitivity test, checks for the ability to differentiate between light and dark (contrast). This ability, is as much an important sense as 20/20, allowing us to be able to carry out everyday tasks safely.

The Hamilton-Veale Contrast Sensitivity Test (photo below), is an effective means of monitoring potential decreases in contrast sensitivity function over time. Even though a person is provided with the best possible refraction (glasses, etc...) they may still complain of not seeing clearly. This problem is often related to a loss of contrast sensitivity.

Contrast Sensitivity Test
The Hamilton-Veale Contrast Sensitivity Chart - Complete Solution

 

HamiltonVeale Contrast Sensitivity Chart
The Hamilton-Veale Contrast Sensitivity Chart

Snellen chart
The Snellen Chart


History of the Hamilton Veale Contrast Sensitivity Test

Why John developed the Hamilton Veale?

Previous testing charts, such as The Pelli-Robson chart, were large, complicated to use and to interpret. As a result, it is not used often enough, in clinical practice or for home testing.

Contrast sensitivity is of concern to everyone interested in diagnosing and treating vision impairment. Eye specialists routinely test eyes for visual acuity, 20/20 or 6/6.

Seldom do they test for the other most important functions of vision; Fields and Contrast Sensitivity. (see example)

There is a need for an easy to understand chart that will test for a loss in Contrast Sensitivity. Loss of Contrast Sensitivity will indicate a serious loss of visual function, and this loss is usually a sign of eye disease.

Ophthalmic professional advice should be sought if a loss in contrast sensitivity is detected.

Remember that a 20/20 result in visual acuity will not always uncover a possible hidden loss in contrast sensitivity.

A test for the hidden loss of vision

John Veale has spent many years developing and testing his contrast sensitivity chart to assist in the measurement of visual loss.

The final product is easy to use, easy to store and easy to track any changes in vision.

The Hamilton Veale
Complete Testing Kits

order complete pack

Contrast Sensitivity and Eye Test Professional Pack - Only
$349 USD

For professional use only.
FREE shipping on all orders
Lifetime replacement warranty.

Complete Contrast Sensitivity and Home Eye Test Kit - Only
$149 USD

Test your own eyes.
FREE shipping on all orders
100% Satisfaction Guaranteed.


John Hamilton Veale
holding the
Pelli Robson Chart developed in 1988.

The Pelli Robson is the accepted gold standard for measuring contrast sensitivity.