Colour vision deficiency
Hello…
What do you feel when you see this??
Beautiful! Amazing! colourful! But many on this earth couldn’t enjoy this beauty. There are approx 1 in 12 men (8%) and 1 in 200 women have Colour vision deficiency in the world.
How do Polarised glasses work?
Why are Polarised glasses used for?
Polarised glasses are mainly used for reducing the glare.
Interesting facts you have never known about human eye
- The eye is the second most complex organ in our body (after the brain). It is composed of more than 2 million operational parts which can process 36,000 bits of information every hour!
How to take care of your Spectacles?
Wearing dusty, scratched and spectacles with smudges cause blurred vision which causes headaches. Hence keep them always clear and clean.
How to find Type of Astigmatism through Prescription?
To find out Type of Astigmatism, We first need to know the classification. There are many but the important ones are based on focal points and Principle meridians.
What to choose – Contact lenses or Spectacles?
Comparison of different aspects in Contact lenses and spectacles are given below.
Contrast Sensitivity and Measuring Methods
What is contrast?
It is created by the difference in luminance from two adjacent surfaces.
According to Michelson,
Dynamic Retinoscopy Methods
Dynamic retinoscopy is also called Near Retinoscopy because it is done while the patient is focusing on a near target(In accommodated state). The main purpose of Dynamic Retinoscopy is to find out the accommodative response of the patient(lag or lead or normal). There are different methods of performing Dynamic Retinoscopy.
Conoid of Sturm-Clinical application
To understand the clinical application of Conoid of Sturm, we need to understand its basic optics.
In simple words, we can say ” Conoid of sturm is just a representation of how rays are refracted through two different powered meridians” (eg: a sphero- cylindrical lens). So, instead of one focal point, they form two focal lines.
Working Distance Calculations in Retinoscopy
Static Retinoscopy can be done in two ways; using a working distance (WD) lens in front of the patient’s eye or without it.
A working distance lens is used to compensate for the distance between the examiner and the patient’s eye. Usually, the working distance is taken as arm length i.e 66cm (+1.50DS)