The eye works like a camera.
While it is referred to as eyeball the shape is not a perfect sphere. It is made of an anterior segment(front) and posterior segment(back) which gives it a curvature and a length, the dimensions of which determine the eye can see with or without glasses.
The anterior segment consists of cornea, iris and lens while the posterior segment consists of retina and choroid.The structures are covered by a tough coat(sclera) or the white of the eye. Rays of light pass through the cornea, which is transparent, the pupil and the lens and land on the retina at the back of the eye from where they are sent to the brain through the optic nerve for interpretation.
Your friend’s poor vision could be due to multiple reasons in addition to the corneal
scar. After thorough examination if the visual impairment is found to be due to
corneal scar, he can undergo corneal transplant surgery to regain vision.
Keratoconus is a condition where the cornea becomes progressively thin and
bulges out causing vision problems. Depending upon the vision and severity,
there are many treatment options available to improve vision. In the early stages
glasses or contact lenses would help. If it is in the advanced stage, you may
require corneal transplant surgery. Corneal Collagen Cross linking (C3R or
CXL) is a minor surgical procedure which will strengthen the cornea and will
prevent worsening of the condition.
With the increased use of online classes computer vision syndrome is becoming
very common among school going children.Visual symptoms which may
include eyestrain, headache, ocular discomfort, dry eye, diplopia and blurred
vision either at near or when looking into the distance after prolonged computer
use can happen. Your child needs assessment of vision and a thorough ocular
Your symptoms may be due to Computer vision syndrome(CVS) which is the
combination of eye and vision problems associated with the use of computers,
mobile phones, tablets etc. that can cause symptoms of dry eyes. After
confirming the diagnosis you will need eye drops to relieve your symptoms and
life style changes.
Depending upon the location of the scar you may require glasses or surgery to
get better vision
If you wear contact lenses, be extremely careful about the way you clean and
• Always wash your hands before handling the contact lenses
• Remove your contact lenses from your eyes every night and carefully
clean them. Store in appropriate cases
• Never use tap water to clean your lenses.
• Never sleep with your contact lenses in your eyes.
Corneal ulcer is infection of the cornea and it is much more serious condition
than conjunctivitis. Redness, watering, pain especially while looking at the
light, dimness of vision are some of the symptoms of a corneal ulcer. It needs
immediate medical attention to prevent vision threatening complications.
Bacterial infections respond to antibiotic drops. Viral infections need
symptomatic treatment. It is contagious and can spread to others easily by direct
contact or droplet infection.
Infective conjunctivitis can affect one eye or both eyes. The whites of your eyes
appear red. Your eyes may feel gritty, watery or sticky and your eyelids may
become swollen and get stuck together, especially in the mornings. You may
also get flu-like symptoms such as a sore throat, fever, muscle ache, and feel
The outermost thin transparent membrane covering the white of your eye is
known as the conjunctiva. Conjunctivitis means inflammation of the
conjunctiva. It can be because of an infection from bacteria, viruses etc or can
be due to allergy.