Congenital Cataract Clinical Trial
Official title:
The Effect of Ophthalmic Solutions on Contact Lenses Used After Surgery for Congenital Cataract Investigated in Vivo
Patients with congenital cataract operated at St. Erik Eye Hospital are given the topical
steroid dexamethasone (Isopto-Maxidex) according to a set treatment plan. They are provided
a contact lens made of the polymer Filcon 4A that is frequently replaced due to the results
of previous in vitro studies that have shown accumulation of preservatives in the hydrogel
contact lens matrix which could question their use in combination with ophthalmic solutions.
We conducted a pilot study that indicate that the results in vivo are different from the
results in vitro and we suspect that insignificant amounts of dexamethasone and benzalkonium
chloride are taken up by the lenses due to tear drainage.
Contact lenses from 30 patients at St. Erik Hospital that have undergone surgery for
congenital cataract and are treated with eye drops containing dexamethasone and benzalkonium
chloride will be collected and analyzed. Ultraviolet-Visible spectrophotometer (UV-vis) and
Laser desorption ionization-mass spectrometry (LDI-MS) will be used to study uptake and
release of dexamethasone and benzalkonium chloride. Scanning electron microscopy (SEM) will
be used to study surface morphology. Thirty Contact lenses from a control group without
topical treatment will also be analyzed. Data will consist of contact lens material, wearing
time, pharmaceutical agents, contact lens solution when applicable, diagnosis and possible
co-morbidity.
Status | Not yet recruiting |
Enrollment | 80 |
Est. completion date | December 2019 |
Est. primary completion date | December 2018 |
Accepts healthy volunteers | |
Gender | All |
Age group | N/A to 7 Years |
Eligibility |
Inclusion Criteria: - Patients that has undergone surgery for congenital cataract - Must have used contact lenses for 30 +/- days in conjunction with the surgery - Must have followed the set treatment dexamethasone treatment plan Exclusion Criteria: - Patients that has used other eye drops in combination with the investigated drop |
Country | Name | City | State |
---|---|---|---|
n/a |
Lead Sponsor | Collaborator |
---|---|
St. Erik Eye Hospital |
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Uptake or no uptake of dexamethasone and/or benzalkonium chloride in used contact lenses. | Contact lenses from patients at St. Erik Eye Hospital that have undergone surgery for congenital cataract and are treated with eye drops containing dexamethasone and benzalkonium chloride will be collected and analyzed. Ultraviolet-Visible spectrophotometer (UV-vis) and Laser desorption ionization-mass spectrometry (LDI-MS) will be used to study uptake and release of dexamthasone and benzalkonium chloride. Scanning electron microscopy (SEM) will be used to study surface morphology. Contact lenses from a control group that has had no surgery and therefore no topical treatment will also be analyzed. | Contact lenses will be collected and analyzed after 30 +/- 5 days of use. |
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