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Dose-Response Relationship: Potency and Efficacy

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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Direct-Acting Cholinergic Agonists: Therapeutic Uses

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Related Experiment Video

Updated: Jul 16, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
05:05

Ultrasound Cyclo Plasty in Eyes with Glaucoma

Published on: January 26, 2018

Dilation efficacy: is 1% cyclopentolate enough?

Timothy Hug1, Scott Olitsky

  • 1Department of Ophthalmology, The Children's Mercy Hospitals and Clinics, Kansas City, Missouri 64108, USA. thug@cmd.edu

Optometry (St. Louis, Mo.)
|February 27, 2007
PubMed
Summary

A single drop of 1% cyclopentolate effectively dilates pupils for pediatric eye exams. This method simplifies the process, offering a viable alternative to multiple drops for better patient comfort and clinician efficiency.

Area of Science:

  • Ophthalmology
  • Pediatric Eye Care

Background:

  • Pediatric eye exams commonly require cycloplegia and dilation.
  • Current practice often involves 2-3 different eye drop medications for instillation ease.

Purpose of the Study:

  • To evaluate the efficacy of a single drop of a cycloplegic agent for pupil dilation in children.
  • To determine if a simplified instillation method can achieve adequate results for pediatric eye examinations.

Main Methods:

  • Children aged 1-7 years received 1% cyclopentolate in one eye and combination drops in the other.
  • Pupil diameter was measured, and iris color was classified after instillation.
  • Statistical analysis compared pupil dilation between different medication groups and eyes.

Main Results:

Related Experiment Videos

Last Updated: Jul 16, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
05:05

Ultrasound Cyclo Plasty in Eyes with Glaucoma

Published on: January 26, 2018

  • Mean pupil sizes were comparable across all groups (6.19-6.56 mm).
  • No statistically significant difference in pupil diameter was found between the paired eyes.
  • Iris color influenced dilation, with lighter irises showing greater dilation.

Conclusions:

  • A single drop of 1% cyclopentolate effectively achieves cycloplegia and pupil dilation for pediatric eye exams.
  • This single-drop approach is easier to administer and should be considered for routine pediatric eye care.