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Driving ability after pupillary dilatation.

S Goel1, P Maharajan, C Chua

  • 1SHO Ophthalmology Kent County Ophthalmic Hospital Maidstone ME14 1DT, UK. sidgoel@hotmail.com

Eye (London, England)
|August 21, 2003
PubMed
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Driving after pupillary dilatation poses significant risks due to reduced visual acuity and increased glare sensitivity. This study confirms that dilated pupils impair driving ability, supporting current recommendations against it.

Area of Science:

  • Ophthalmology
  • Optometry
  • Road Safety

Background:

  • Current guidelines from the Royal College of Ophthalmologists and DVLA advise against driving with dilated pupils, citing potential vision impairment.
  • Some debate exists regarding the actual impact of pupillary dilation on driving capabilities.

Purpose of the Study:

  • To investigate the effects of pupillary dilation on a patient's ability to drive.
  • To provide empirical evidence for or against current driving restrictions post-mydriasis.

Main Methods:

  • A prospective, randomized study involving 28 patients.
  • Visual parameters including distance and near visual acuity, license plate readability, and glare were measured before and after tropicamide 1% eye drop instillation.
  • Statistical analysis employed paired two-tailed Student's t-tests and chi-squared tests.

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Main Results:

  • A significant decrease in distance and near visual acuity was observed 20 minutes post-dilation.
  • The ability to read a license plate at 20 meters was significantly reduced.
  • Subjective glare assessment increased from none to mild, and 14% of patients reported difficulty driving post-dilation.

Conclusions:

  • The study validates the rationale for prohibiting driving after pupillary dilation.
  • Significant reductions in visual quality and quantity post-dilation pose considerable risks to safe driving.