COLOUR BLINDNESS

COLOUR BLINDNESS OR COLOUR VISION DEFECIENCY

Colour vision deficiency is the decreased ability to see the colour or differences in the colours.

The most common cause of colour blindness is an inherited fault in the development of one or more of three sets of colour sensing cones in the eye . Males are more likely to be colour blind than females. Incidence  in male is 1 in 12 men and in female 1 in 200 females as the genes responsible for the most common forms of colour blindness are on “X” chromosome  .

Diagnosis is done with the ISHIHARA COLOUR CHART TEST .

AQUIRED CAUSES OF COLOUR BLINDNESS —-

  1. Chronic illness -Alzheimer’s disease , Diabetes Mellitus. , Glaucoma , Leukaemia , liver disease, Chronic alcoholism , Macular degeneration , Multiple sclerosis , Parkinson’s disease, Sickle cell anaemia , Retinitis pigmentosa
  2. Drugs causing colour blindness – Barbiturates, antituberculosis drugs , antihypertensive drugs .

No cure for hereditary or genetic colour blindness. If you become aware of a colour deficiency early enough in life you may be a

COLOUR BLINDNESSble to compensate by training for one of the many careers to see in a full range of colour.

Special lenses are available to enhance the colour perception.

How can you detect colour blindness by yourself?

  • Colour blind person sees green colour as brown colour.
  • Regular eye check-up at doctor clinic is recommended so that it can be detected.

Ishchiara chart

COLOUR BLINDNESS

squint eyes

Myths and Facts Related to Squint

What is Squint?

Squint, or strabismus, is a condition in which the visual axes of the eyes are not parallel and the eyes appear to be looking in different directions.

Inward deviation of the eye or eyes is called esotropia and outward deviation is called exotropia. There are various causative factors like genetic or hereditary, neurological, pre-maturity, high spectacle number, or injury (to the head or eyes). No two patients with squint are exactly alike and each patient requires a thorough evaluation and proper treatment by a specialist.

There are several myths related to the perception and treatment of squint especially in children, in whom early evaluation and treatment is crucial. The following is an attempt to state the facts from a scientific perspective:

MYTH 1: Squint in Small Children Will Go Away on its Own:

FACT: Except in very rare cases, squint does not disappear on its own. This is a popular belief harbored by many parents and re-inforced by some doctors too. This leads to unnecessary delay in treatment and consequently permanent loss of vision in one eye in the child. Squint should be evaluated as soon as diagnosed as only timely intervention can preserve vision and 3 D vision in the child. So remember, NO ‘WAIT AND WATCH’!

MYTH 2: Squint is Just a Cosmetic Problem

FACT: In addition to it being a cosmetic problem, it more importantly is a functional problem as every day of untreated squint means compromise of the full visual potential in the child. Early treatment of squint is not only to straighten the eyes for cosmetic reasons, but to prevent deterioration of vision and binocularity. Binocularity is the condition in which both eyes work together to achieve 3 dimensional vision and depth perception. This has implications in many day to day activities like driving, appreciating 3 D movies, as also in many careers like aviation, military, stereoscopic surgery etc. Lack of binocularity reduces the field of vision and renders the patient more susceptible to injuries. A patient with squint is actually looking at the world with only one eye at a time, hence the vision of the squinting eye can get severely and permanently reduced leading to a lazy eye. Squint can also be a manifestation of serious underlying disease in the eye, like a tumour, cataract or infection, and hence needs prompt attention.

Read more about the Squint Eyes Causes, Symptoms, Treatments & Surgeries 

MYTH 3: There is No Treatment for Squint

FACT: Depending on the type of squint, there are many treatment options like glasses, eye patching in which lazy eye is made to work more as compared to normal eye, vision therapy exercises like synaptophore, prisms and surgery. Any one or a combination of these treatment modalities may have to be used depending upon the case. Treatment of squint is long term and yield successful results, so commitment and co operation of the parents is as important as the doctor’s skill. Squint can be treated at any age, even in adults, but treatment done in childhood gives the best results.

MYTH 4: Squint Surgery Will Cause Damage to The Eye

FACT: Squint surgery is one of the safest eye surgeries as it is extraocular (does not involve opening or entering the eye like in cataract surgery). Only the muscles on the white portion of the eye are tightened or loosened and there is no damage to vision or permanent scar visible after surgery.

MYTH 5: Squint Will Recur After Surgery

FACT: This is more of a fear in parents’ minds which prevents them from going in for the surgery. With proper pre operative evaluation and operative technique, the chances of recurrence in childhood squint are very less. More harm will be caused by not doing the surgery than the recurrence if it occurs at all. Recurrence  after surgery may occur after many years and there are non surgical and surgical options to treat that as well.

Read more about the FAQs Related to Squint Eyes 

MYTH 6: My Child is Too Small to Undergo Surgery

FACT: The earlier your child is treated for squint, be it with glasses or surgery, the better results you will get. Now a days, general anaesthesia techniques are very safe, and the surgery itself carries hardly any risk. So no child is too young for surgery if surgery is indicated. Remember that timing is critical for proper visual development, so do not delay surgery if it is required for your child’s benefit.

In conclusion, parents and doctors have to work hand in hand and take adequate and early measures to prevent avoidable blindness or visual impairment caused due to squint.