New perspectives on glaucoma screening

Area of Science:

• Ophthalmology
• Optometry

Background:

• Glaucoma is defined by elevated intraocular pressure (IOP) causing visual field defects.
• Ocular hypertension is elevated IOP without visual field defects.
• Open-angle glaucoma affects less than 1% of individuals over 40.

Purpose of the Study:

• To clarify the relationship between elevated IOP and glaucoma.
• To emphasize the importance of visual field testing in glaucoma screening.

Main Methods:

• Review of glaucoma definitions and prevalence data.
• Discussion of the concept of variable ocular pressure sensitivity.

Main Results:

• Approximately 10% of individuals with elevated IOP have glaucoma.
• Variable sensitivity explains why some with high IOP do not develop glaucoma.

Conclusions:

• Glaucoma screening using tonometry is only justified when combined with visual field testing.
• Accurate diagnosis requires assessing both intraocular pressure and visual field status.