A 6-year-old girl was referred to
the ophthalmology clinic by the School Health Service of the Health Promotion Board.
She had been referred for a re-assessment at the Board after she was identified
as myopic in a mass vision test performed at her primary school. The results of
her vision test during the mass screening was 6/18 and 6/9, for the right and
left eye, respectively. As her right eye vision test result was greater than
6/9, she was then referred to do a re-assessment at the Board. The results of
her vision re-assessment were 6/18 correctable to 6/9 and 6/12 correctable to
6/6, for the right and left eye, respectively. The attending optometrist was
contemplating on giving her a prescription for glasses or to refer her to the ophthalmology
clinic. The point of concern was that the girl’s vision could not be corrected
to 6/6 with the appropriate lenses. To err on the side of caution, she was referred
to the National University Hospital Medical Centre.
She was born following a normal full-term pregnancy
by vacuum-assisted delivery. There were no neonatal problems and
her development was normal. She was often described as a very lively child but
timid and fearful of doctors, teachers and other seemingly authoritative
figures.
Both her
parents do not have myopia though her grandmother had amblyopia, commonly known
as lazy eye.
At the ophthalmology
clinic, though her visual acuity test indicated that one of her eyes has poorer
vision than the other, her 3-D vision test was ‘normal’. Her vision test was
found to be 6/6 for both her eyes and her dilated eye examination did not
reveal any significant findings. She was discharged as having normal vision and
does not need any glasses.
The
question now is that how was she assessed as having myopia on two earlier occasions?
Wouldn’t the prescribed glasses have worsened her vision since it was not needed
in the first instance? The ophthalmologist clarified that vision tests for
children could sometimes be inaccurate as they rely heavily on the child’s
responses and the subjective interpretation of the optometrist. A child that is
uncooperative because she/he is shy might end up with a poor test vision
result. Upon further discussion with the girl’s mother, it was found the mother
was absent on the two earlier ‘failed’ vision assessments and was only present
at the last eye-examination session. Could the girl had been so anxious that
she could not read aloud the letters flashed before her, only to be calm enough
to do so when her mother is present?
