Comparison of Haptic Orientation in Negative Dysphotopsia

Comparison of Horizontal and Vertical IOL Haptic Orientation in Negative Dysphotopsia.

Status

Withdrawn

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02724553

Enrollment

Registered

2016-03-31

Start date

2016-04-30

Completion date

2016-11-30

Last updated

2016-11-30

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Negative Dysphotopsia

Brief summary

Previous studies attempted to understand the dysphotopsia phenomenon by examining intraocular lens type, anterior capsule depth, iris-to-lens depth, lens refractive material, clear cornea incision wounds and anterior capsulorrhexis. However, there is limited literature in understanding haptic orientation and negative dysphotopsia; postulated theories and anecdotal reports relate to horizontal haptic orientation and the lateralization of rays such that light is received both in smaller width and anterior to the peripheral retina; however, no formal studies currently exist.

Interventions

DEVICEAcrylic lens implantation

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

PREVENTION

Masking

SINGLE (Subject)

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

Patients with bilateral cataracts that are visually significant meeting standard criteria for removal and select standard monofocal lens implantation.

Exclusion criteria

Patients with any prior refractive surgery including prior cataract surgery, corneal ocular pathology, iris atrophy/damage, retinal or optic nerve pathology. Patients with history of peripheral vision loss. Patients selecting multifocal or toric lens implantation.

Design outcomes

Primary

Measure	Time frame	Description
Presence of negative dysphotopsia after cataract surgery at 6 months	6 months	Presence of negative dysphotopsia in the vertical IOL placement compared to horizontal IOL placement

Secondary

Measure	Time frame	Description
Presence of negative dysphotopsia after cataract surgery at 1 week	1 week	Presence of negative dysphotopsia in the vertical IOL placement compared to horizontal IOL placement
Presence of negative dysphotopsia after cataract surgery at 1 month	1 month	Presence of negative dysphotopsia in the vertical IOL placement compared to horizontal IOL placement

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026