Corneal Topography and High Order Aberrations in Regular Contraceptive Pills

Comparing corneal topographic changes and corneal high-order aberrations for women planning to use oral contaceptive pills before and after the usage of the pills

• Hormonal Contraception (Other): Effect of usage of hormonal contraceptive pills on corneal topography and corneal high-order aberrations
• Combined Oral Contraceptive (COC) (Drug): Participants who are prescribed combined oral contraceptive pills as part of routine clinical care will be observed. Corneal topography and tomography will be performed before starting treatment and after the follow-up period to evaluate changes in corneal parameters.

Primary outcomes

• Change in K1 (D) [Baseline and 1 year]
• Change in K2 (D) [one year]
• Change in Kmax (D) [one year]
• change in corneal thickness (um) [one year]

Sex: Female, ages: 18 Years to 40 Years, accepts healthy volunteers

Inclusion Criteria:

* Female participants aged 18-40 years.
* Prescribed combined oral contraceptive pills as part of routine gynecological care.
* Willing to undergo corneal topography/tomography before starting treatment and after 1 year.
* No previous history of corneal disease or ocular surgery.
* Able to provide informed consent.

Exclusion Criteria:

* Keratoconus or suspected corneal ectasia.
* Corneal opacity, dystrophy, degeneration, or scarring.
* Previous ocular surgery or significant ocular trauma.
* Current contact lens use or recent contact lens use without adequate discontinuation period.
* Active ocular surface disease or severe dry eye.
* Glaucoma, uveitis, retinal disease, or other significant ocular pathology.
* Diabetes mellitus, autoimmune disease, thyroid disease, pregnancy, or lactation.
* Use of other hormonal therapy or systemic medications known to affect corneal parameters.